2024/12/15 更新

写真a

チョウ　ケイチョウ
張　溪超
News & Topics
所属
理工学術院 理工学術院総合研究所
職名
次席研究員（研究院講師）
学位
博士（学術） ( 2018年09月 信州大学 )
メールアドレス
メールアドレス
ホームページ
https://w-rdb.waseda.jp/html/100003521_en.html
プロフィール

Dr. Xichao Zhang is currently an Assistant Professor at Waseda University, Japan. He is a member of Prof. Masahito Mochizuki’s Theoretical Group and works jointly with Dr. Xiuzhen Yu’s Electronic States Microscopy Research Team at RIKEN. He received his Ph.D. from Shinshu University in 2018, and was a JSPS Postdoctoral Fellow at Shinshu University (2020-2022). He also worked at the Chinese University of Hong Kong, Shenzhen (2016-2020) and the University of Hong Kong (2014-2016). In 2019, he was awarded the Presidential Postdoctoral Fellowship from the Chinese University of Hong Kong, Shenzhen, and he was elected to be an IEEE Senior Member in 2024.

Dr. Zhang’s research interests broadly encompass spintronics, magnetism, and mesoscopic physics, with a focus on the theoretical and computational study of spin textures, spin dynamics, and spintronic devices. He has been exploring different species of topological spin textures since 2013, including skyrmions, antiskyrmions, skyrmioniums, bimerons, and bimeroniums. Some specific systems that Dr. Zhang works on include bulk chiral magnets, thin films with interfacial chiral interactions, synthetic antiferromagnetic and ferrimagnetic multilayers, and frustrated spin systems. He has also been investigating functional applications such as logic computing gates and transistor-like devices that use topological spin textures in magnetic nanostructures. Recently, his research particularly focuses on the complex dynamics of topological spin textures interacting with artificially nanostructured surfaces and interfaces. In addition, he works on interdisciplinary topics that put concepts from biological physics, soft matter, and fluid dynamics in contact with important questions in spintronics, such as the complex flow phenomena of particle-like spin textures and the dynamic interactions between chiral spin textures and chiral flower-like structures.

Dr. Zhang has published 40 first and co-first author papers in peer-reviewed academic journals, including Nature Physics/Electronics/Communications, Physical Review Letters/Applied/B, Nano Letters, and Applied Physics Letters. He has also coauthored over 80 peer-reviewed academic papers through collaboration with experimental and theoretical groups around the world. Besides, he has contributed five invited chapters to three international books published by Taylor & Francis Group, Elsevier, and Springer. His Google Scholar citations are above 10,000 with an h-index of 41 (as of April, 2024).

>>>SELECTED PUBLICATIONS<<<

[01] “Skyrmion Dynamics in a Frustrated Ferromagnetic Film and Current-Induced Helicity Locking-Unlocking Transition”,
X. Zhang, J. Xia, Y. Zhou, X. Liu, H. Zhang, and M. Ezawa,
Nature Communications 8, 1717 (2017).
DOI: 10.1038/s41467-017-01785-w

[02] “Magnetic Bilayer-Skyrmions without Skyrmion Hall Effect”,
X. Zhang, Y. Zhou, and M. Ezawa,
Nature Communications 7, 10293 (2016).
DOI: 10.1038/ncomms10293

[03] “Configurable Pixelated Skyrmions on Nanoscale Magnetic Grids”,
X. Zhang, J. Xia, K. Shirai, H. Fujiwara, O. A. Tretiakov, M. Ezawa, Y. Zhou, and X. Liu,
Communications Physics 4, 255 (2021).
DOI: 10.1038/s42005-021-00761-7

[04] “Magnetic Skyrmion Logic Gates: Conversion, Duplication and Merging of Skyrmions”,
X. Zhang, M. Ezawa, and Y. Zhou,
Scientific Reports 5, 9400 (2015).
DOI: 10.1038/srep09400

[05] “Laminar and Transiently Disordered Dynamics of Magnetic-Skyrmion Pipe Flow”,
X. Zhang, J. Xia, O. A. Tretiakov, M. Ezawa, G. Zhao, Y. Zhou, X. Liu, and M. Mochizuki,
Physical Review B 108, 144428 (2023).
DOI: 10.1103/PhysRevB.108.144428

[06] “Static and Dynamic Properties of Bimerons in a Frustrated Ferromagnetic Monolayer”,
X. Zhang, J. Xia, L. Shen, M. Ezawa, O. A. Tretiakov, G. Zhao, X. Liu, and Y. Zhou,
Physical Review B 101, 144435 (2020).
DOI: 10.1103/PhysRevB.101.144435

[07] “Control and Manipulation of a Magnetic Skyrmionium in Nanostructures”,
X. Zhang, J. Xia, Y. Zhou, D. Wang, X. Liu, W. Zhao, and M. Ezawa,
Physical Review B 94, 094420 (2016).
DOI: 10.1103/PhysRevB.94.094420

[08] “Chiral Skyrmions Interacting with Chiral Flowers”,
X. Zhang, J. Xia, O. A. Tretiakov, M. Ezawa, G. Zhao, Y. Zhou, X. Liu, and M. Mochizuki,
Nano Letters 23, 11793 (2023).
DOI: 10.1021/acs.nanolett.3c03792

[09] “A Frustrated Bimeronium: Static Structure and Dynamics”,
X. Zhang, J. Xia, M. Ezawa, O. A. Tretiakov, H. T. Diep, G. Zhao, X. Liu, and Y. Zhou,
Applied Physics Letters 118, 052411 (2021).
DOI: 10.1063/5.0034396

[10] “Direct Observation of the Skyrmion Hall Effect”,
W. Jiang, X. Zhang, G. Yu, W. Zhang, X. Wang, M. B. Jungfleisch, J. E. Pearson, X. Cheng, O. Heinonen, K. L. Wang, Y. Zhou, A. Hoffmann, and S. G. E. te Velthuis,
Nature Physics 13, 162 (2017).
DOI: 10.1038/nphys3883

経歴

  • 2023年01月
    -
    継続中

    早稲田大学   理工学術院総合研究所   次席研究員（研究院講師）

  • 2020年11月
    -
    2022年11月

    信州大学   工学部   日本学術振興会外国人特別研究員

  • 2020年01月
    -
    2020年11月

    香港中文大学（深セン）   理工学部   研究員

  • 2019年01月
    -
    2019年12月

    香港中文大学（深セン）   理工学部   博士研究員

  • 2016年09月
    -
    2018年12月

    香港中文大学（深セン）   理工学部   研究助手

  • 2016年04月
    -
    2018年09月

    信州大学   工学部   日本学術振興会論博研究者

  • 2014年08月
    -
    2016年08月

    香港大学   物理学科   研究助手

▼全件表示

学歴

  • 　
    -
    2018年09月

    信州大学   大学院総合工学系研究科   博士（学術）  

  • 　
    -
    2014年06月

    四川師範大学   物理・電子工学部物理学科   学士（理学）  

所属学協会

研究分野

  • 磁性、超伝導、強相関系 / 応用物理一般 / 電気電子材料工学

研究キーワード

  • 磁性

  • 磁性材料

  • ナノ磁性

  • マイクロ磁気学

  • フラストレート磁性

  • トポロジカル磁性

  • スピントロニクス

  • スピンデバイス

  • スキルミオン

▼全件表示

受賞

メディア報道

▼全件表示

 

論文

  • スキルミオンのアクティブマター挙動

    望月維人, 張渓超, 劉小晰

    日本物理学会誌   79 ( 10 ) 549 - 554  2024年10月  [招待有り]  [国内誌]

    DOI

  • Confined antiskyrmion motion driven by electric current excitations

    Yao Guang, Xichao Zhang, Yizhou Liu, Licong Peng, Fehmi Sami Yasin, Kosuke Karube, Daisuke Nakamura, Naoto Nagaosa, Yasujiro Taguchi, Masahito Mochizuki, Yoshinori Tokura, Xiuzhen Yu

    Nature Communications   15 ( 1 ) 7701  2024年09月  [査読有り]  [国際誌]

    担当区分：筆頭著者

    DOI

    Scopus

  • Transformation of a cellular skyrmion to polyomino-like structures

    Jing Xia, Xichao Zhang, Yan Zhou, Xiaoxi Liu, Guoping Zhao, Masahito Mochizuki

    Applied Physics Letters   125 ( 3 ) 032404  2024年07月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    Topological spin structures with transformable shapes may have potential implications for data storage and computation. Here, we demonstrate that a square cellular skyrmion on an artificial grid pinning pattern can be manipulated by programmed current pulses. We find that parallel short pulses could result in elongation of the skyrmion mainly in the current direction, while parallel long pulses are able to induce elongation in the direction perpendicular to the current due to the intrinsic skyrmion Hall effect. Consequently, a programmed sequence of parallel pulses could lead to transformation of the skyrmion to I-, L-, and Z-shaped polyomino-like structures without affecting the topological charge. In addition, we find that orthogonal pulses could lead to the transformation to more complex polyomino-like structures, including T-shaped and irregular ones. Particularly, when a small T-shaped structure is formed, the topological charge of the system is found to be non-integer due to incomplete compensation of local topological charge densities; however, the T-shaped structure is stable on the attractive pinning pattern. Our results offer an effective way to create polyomino-like spin structures toward functional applications.

    DOI

    Scopus

    1
    被引用数
    (Scopus)

  • Bimerons create bimerons: Proliferation and aggregation induced by currents and magnetic fields

    Xichao Zhang, Yan Zhou, Xiuzhen Yu, Masahito Mochizuki

    Aggregate    2024年05月  [査読有り]  [招待有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    The aggregation of topological spin textures at nano and micro scales has practical applications in spintronic technologies. Here, the authors report the in‐plane current‐induced proliferation and aggregation of bimerons in a bulk chiral magnet. It is found that the spin‐transfer torques can induce the proliferation and aggregation of bimerons only in the presence of an appropriate out‐of‐plane magnetic field. It is also found that a relatively small damping and a relatively large non‐adiabatic spin‐transfer torque could lead to more pronounced bimeron proliferation and aggregation. Particularly, the current density should be larger than a certain threshold in order to trigger the proliferation; namely, the bimerons may only be driven into translational motion under weak current injection. Besides, the authors find that the aggregate bimerons could relax into a deformed honeycomb bimeron lattice with a few lattice structure defects after the current injection. The results are promising for the development of bio‐inspired spintronic devices that use a large number of aggregate bimerons. The findings also provide a platform for studying aggregation‐induced effects in spintronic systems, such as the aggregation‐induced lattice phase transitions.

    DOI

    Scopus

    1
    被引用数
    (Scopus)

  • Magnon-Skyrmion Hybrid Quantum Systems: Tailoring Interactions via Magnons

    Xue-Feng Pan, Peng-Bo Li, Xin-Lei Hei, Xichao Zhang, Masahito Mochizuki, Fu-Li Li, Franco Nori

    Physical Review Letters   132 ( 19 ) 193601  2024年05月  [査読有り]  [国際誌]  [国際共著]

    DOI

  • Spontaneous Vortex‐Antivortex Pairs and Their Topological Transitions in a Chiral‐Lattice Magnet

    Xiuzhen Yu, Naoya Kanazawa, Xichao Zhang, Yoshio Takahashi, Konstantin V. Iakoubovskii, Kiyomi Nakajima, Toshiaki Tanigaki, Masahito Mochizuki, Yoshinori Tokura

    Advanced Materials   36 ( 1 ) 2306441  2024年01月  [査読有り]  [国際誌]

    　概要を見る

    Abstract

    The spontaneous formation and topological transitions of vortex‐antivortex pairs have implications for a broad range of emergent phenomena, for example, from superconductivity to quantum computing. Unlike magnets exhibiting collinear spin textures, helimagnets with noncollinear spin textures provide unique opportunities to manipulate topological forms such as (anti)merons and (anti)skyrmions. However, it is challenging to achieve multiple topological states and their interconversion in a single helimagnet due to the topological protection for each state. Here, the on‐demand creation of multiple topological states in a helimagnet Fe0.5Co0.5Ge, including a spontaneous vortex pair of meron with topological charge N = −1/2 and antimeron with N = 1/2, and a vortex‐antivortex bundle, that is, a bimeron (meron pair) with N = −1 is reported. The mutual transformation between skyrmions and bimerons with respect to the competitive effects of magnetic field and magnetic shape anisotropy is demonstrated. It is shown that electric currents drive the individual bimerons to form their connecting assembly and then into a skyrmion lattice. These findings signify the feasibility of designing topological states and offer new insights into the manipulation of noncollinear spin textures for potential applications in various fields.

    DOI

    Scopus

    8
    被引用数
    (Scopus)

  • Chiral Skyrmions Interacting with Chiral Flowers

    Xichao Zhang, Jing Xia, Oleg A. Tretiakov, Motohiko Ezawa, Guoping Zhao, Yan Zhou, Xiaoxi Liu, Masahito Mochizuki

    Nano Letters   23 ( 24 ) 11793 - 11801  2023年12月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

    Scopus

    5
    被引用数
    (Scopus)

  • Laminar and transiently disordered dynamics of magnetic-skyrmion pipe flow

    Xichao Zhang, Jing Xia, Oleg A. Tretiakov, Motohiko Ezawa, Guoping Zhao, Yan Zhou, Xiaoxi Liu, Masahito Mochizuki

    Physical Review B   108 ( 14 ) 144428  2023年10月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

  • Reversible magnetic domain reorientation induced by magnetic field pulses of fixed direction

    Xichao Zhang, Jing Xia, Oleg A. Tretiakov, Guoping Zhao, Yan Zhou, Masahito Mochizuki, Xiaoxi Liu, Motohiko Ezawa

    Physical Review B   108 ( 6 ) 064410  2023年08月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

  • Current-Induced Helicity Switching of Frustrated Skyrmions on a Square-Grid Obstacle Pattern

    X. Zhang, J. Xia, O. A. Tretiakov, H. T. Diep, G. Zhao, J. Yang, Y. Zhou, M. Ezawa, X. Liu

    Journal of the Magnetics Society of Japan   47 ( 1 ) 20 - 27  2023年01月  [査読有り]  [国内誌]  [国際共著]

    担当区分：筆頭著者

    DOI

  • Reversible Transformation between Isolated Skyrmions and Bimerons

    Kentaro Ohara, Xichao Zhang, Yinling Chen, Satoshi Kato, Jing Xia, Motohiko Ezawa, Oleg A. Tretiakov, Zhipeng Hou, Yan Zhou, Guoping Zhao, Jinbo Yang, Xiaoxi Liu

    Nano Letters   22 ( 21 ) 8559 - 8566  2022年10月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者, 責任著者

    DOI

    Scopus

    26
    被引用数
    (Scopus)

  • Particle-like skyrmions interacting with a funnel obstacle

    Xichao Zhang, Jing Xia, Xiaoxi Liu

    Physical Review B   106 ( 9 ) 094418  2022年09月  [査読有り]  [国際誌]

    担当区分：筆頭著者

    DOI

  • Bifurcation of a topological skyrmion string

    Jing Xia, Xichao Zhang, Oleg A. Tretiakov, Hung T. Diep, Jinbo Yang, Guoping Zhao, Motohiko Ezawa, Yan Zhou, Xiaoxi Liu

    Physical Review B   105 ( 21 ) 214402  2022年06月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

  • Structural transition of skyrmion quasiparticles under compression

    Xichao Zhang, Jing Xia, Xiaoxi Liu

    Physical Review B   105 ( 18 ) 184402  2022年05月  [査読有り]  [国際誌]

    担当区分：筆頭著者

    DOI

  • Exchange-Torque-Triggered Fast Switching of Antiferromagnetic Domains

    Jia Xu, Jing Xia, Xichao Zhang, Chao Zhou, Dong Shi, Haoran Chen, Tong Wu, Qian Li, Haifeng Ding, Yan Zhou, Yizheng Wu

    Physical Review Letters   128 ( 13 ) 137201  2022年04月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

  • Dynamic transformation between a skyrmion string and a bimeron string in a layered frustrated system

    Xichao Zhang, Jing Xia, Oleg A. Tretiakov, Hung T. Diep, Guoping Zhao, Jinbo Yang, Yan Zhou, Motohiko Ezawa, Xiaoxi Liu

    Physical Review B   104 ( 22 ) L220406  2021年12月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

  • Configurable pixelated skyrmions on nanoscale magnetic grids

    Xichao Zhang, Jing Xia, Keiichiro Shirai, Hiroshi Fujiwara, Oleg A. Tretiakov, Motohiko Ezawa, Yan Zhou, Xiaoxi Liu

    Communications Physics   4 ( 1 ) 255  2021年12月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    <title>Abstract</title>Topological spin textures can serve as non-volatile information carriers. Here we study the current-induced dynamics of an isolated magnetic skyrmion on a nanoscale square-grid pinning pattern formed by orthogonal defect lines with reduced magnetic anisotropy. The skyrmion on the square grid can be pixelated with a quantized size of the grid. We demonstrate that the position, size, and shape of skyrmion on the square grid are electrically configurable. The skyrmion center is quantized to be on the grid and the skyrmion may show a hopping motion instead of a continuous motion. We find that the skyrmion Hall effect can be perfectly prohibited due to the pinning effect of the grid. The pixelated skyrmion can be harnessed to build future programmable racetrack memory, multistate memory, and logic computing device. Our results will be a basis for digital information storage and computation based on pixelated topological spin textures on artificial pinning patterns.

    DOI

    Scopus

    14
    被引用数
    (Scopus)

  • Confinement and Protection of Skyrmions by Patterns of Modified Magnetic Properties

    Kentaro Ohara, Xichao Zhang, Yinling Chen, Zonhan Wei, Yungui Ma, Jing Xia, Yan Zhou, Xiaoxi Liu

    Nano Letters   21 ( 10 ) 4320 - 4326  2021年05月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

    Scopus

    41
    被引用数
    (Scopus)

  • Current-induced dynamics of skyrmion tubes in synthetic antiferromagnetic multilayers

    Jing Xia, Xichao Zhang, Kai-Yu Mak, Motohiko Ezawa, Oleg A. Tretiakov, Yan Zhou, Guoping Zhao, Xiaoxi Liu

    Physical Review B   103 ( 17 ) 174408  2021年05月  [査読有り]  [国際共著]

    担当区分：筆頭著者

    DOI

  • A frustrated bimeronium: Static structure and dynamics

    Xichao Zhang, Jing Xia, Motohiko Ezawa, Oleg A. Tretiakov, Hung T. Diep, Guoping Zhao, Xiaoxi Liu, Yan Zhou

    Applied Physics Letters   118 ( 5 ) 052411 - 052411  2021年02月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    We show a topological spin texture called "bimeronium" in magnets with in-plane magnetization. It is a topological counterpart of skyrmionium in perpendicularly magnetized magnets and can be seen as a combination of two bimerons with opposite topological charges. We report the static structure and spin-orbit-torque-induced dynamics of an isolated bimeronium in a magnetic monolayer with frustrated exchange interactions. We study the anisotropy and magnetic field dependences of a static bimeronium. We also explore the bimeronium dynamics driven by the damping-like spin-orbit torque. We find that the bimeronium shows steady rotation when the spin polarization direction is parallel to the easy axis. Moreover, we demonstrate the annihilation of the bimeronium when the spin polarization direction is perpendicular to the easy axis. Our results are useful for understanding the fundamental properties of bimeronium structures and may offer an approach to build bimeronium-based spintronic devices.

    DOI

    Scopus

    20
    被引用数
    (Scopus)

  • Topology-Dependent Brownian Gyromotion of a Single Skyrmion

    Le Zhao, Zidong Wang, Xichao Zhang, Xue Liang, Jing Xia, Keyu Wu, Heng-An Zhou, Yiqing Dong, Guoqiang Yu, Kang L. Wang, Xiaoxi Liu, Yan Zhou, Wanjun Jiang

    Physical Review Letters   125 ( 2 ) 027206  2020年07月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

  • Current-driven skyrmionium in a frustrated magnetic system

    Jing Xia, Xichao Zhang, Motohiko Ezawa, Oleg A. Tretiakov, Zhipeng Hou, Wenhong Wang, Guoping Zhao, Xiaoxi Liu, Hung T. Diep, Yan Zhou

    Applied Physics Letters   117 ( 1 ) 012403 - 012403  2020年07月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    Magnetic skyrmionium can be used as a nanometer-scale non-volatile information carrier, which shows no skyrmion Hall effect due to its special structure carrying zero topological charge. Here, we report the static and dynamic properties of an isolated nanoscale skyrmionium in a frustrated magnetic monolayer, where the skyrmionium is stabilized by competing interactions. The frustrated skyrmionium has a size of about 10nm, which can be further reduced by tuning perpendicular magnetic anisotropy or the magnetic field. It is found that the nanoscale skyrmionium driven by the damping-like spin-orbit torque shows directional motion with a favored Bloch-type helicity. A small driving current or magnetic field can lead to the transformation of an unstable Neel-type skyrmionium to a metastable Bloch-type skyrmionium. A large driving current may result in the distortion and collapse of the Bloch-type skyrmionium. Our results are useful for the understanding of frustrated skyrmionium physics, which also provide guidelines for the design of spintronic devices based on topological spin textures.

    DOI

    Scopus

    28
    被引用数
    (Scopus)

  • Static and dynamic properties of bimerons in a frustrated ferromagnetic monolayer

    Xichao Zhang, Jing Xia, Laichuan Shen, Motohiko Ezawa, Oleg A. Tretiakov, Guoping Zhao, Xiaoxi Liu, Yan Zhou

    Physical Review B   101 ( 14 ) 144435  2020年04月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

  • Skyrmion-electronics: writing, deleting, reading and processing magnetic skyrmions toward spintronic applications

    Xichao Zhang, Yan Zhou, Kyung Mee Song, Tae-Eon Park, Jing Xia, Motohiko Ezawa, Xiaoxi Liu, Weisheng Zhao, Guoping Zhao, Seonghoon Woo

    Journal of Physics: Condensed Matter   32 ( 14 ) 143001 - 143001  2020年04月  [査読有り]  [招待有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

  • Dynamics of an elliptical ferromagnetic skyrmion driven by the spin–orbit torque

    Jing Xia, Xichao Zhang, Motohiko Ezawa, Qiming Shao, Xiaoxi Liu, Yan Zhou

    Applied Physics Letters   116 ( 2 ) 022407 - 022407  2020年01月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

    Scopus

    28
    被引用数
    (Scopus)

  • Current‐Induced Helicity Reversal of a Single Skyrmionic Bubble Chain in a Nanostructured Frustrated Magnet

    Zhipeng Hou, Qiang Zhang, Xichao Zhang, Guizhou Xu, Jing Xia, Bei Ding, Hang Li, Senfu Zhang, Nitin M. Batra, Pedro M. F. J. Costa, Enke Liu, Guangheng Wu, Motohiko Ezawa, Xiaoxi Liu, Yan Zhou, Xixiang Zhang, Wenhong Wang

    Advanced Materials   32 ( 1 ) 1904815 - 1904815  2020年01月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

    Scopus

    53
    被引用数
    (Scopus)

  • Generation and Hall effect of skyrmions enabled using nonmagnetic point contacts

    Zidong Wang, Xichao Zhang, Jing Xia, Le Zhao, Keyu Wu, Guoqiang Yu, Kang L. Wang, Xiaoxi Liu, Suzanne G. E. te Velthuis, Axel Hoffmann, Yan Zhou, Wanjun Jiang

    Physical Review B   100 ( 18 )  2019年11月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

  • Current-Driven Dynamics of Frustrated Skyrmions in a Synthetic Antiferromagnetic Bilayer

    Jing Xia, Xichao Zhang, Motohiko Ezawa, Zhipeng Hou, Wenhong Wang, Xiaoxi Liu, Yan Zhou

    Physical Review Applied   11 ( 4 ) 044046  2019年04月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

  • Manipulation of magnetic skyrmions in a locally modified synthetic antiferromagnetic racetrack

    R.P. Loreto, X. Zhang, Y. Zhou, M. Ezawa, X. Liu, C.I.L. de Araujo

    Journal of Magnetism and Magnetic Materials   482   155 - 159  2019年03月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

    Scopus

    9
    被引用数
    (Scopus)

  • Electric Field-Induced Creation and Directional Motion of Domain Walls and Skyrmion Bubbles

    Chuang Ma, Xichao Zhang, Jing Xia, Motohiko Ezawa, Wanjun Jiang, Teruo Ono, S. N. Piramanayagam, Akimitsu Morisako, Yan Zhou, Xiaoxi Liu

    Nano Letters   19 ( 1 ) 353 - 361  2019年01月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    Magnetization dynamics driven by an electric field could provide long-term benefits to information technologies because of its ultralow power consumption. Meanwhile, the Dzyaloshinskii-Moriya interaction in interfacially asymmetric multilayers consisting of ferromagnetic and heavy-metal layers can stabilize topological spin textures, such as chiral domain walls, skyrmions, and skyrmion bubbles. These topological spin textures can be controlled by an electric field and hold promise for building advanced spintronic devices. Here, we present an experimental and numerical study on the electric field-induced creation and directional motion of topological spin textures in magnetic multilayer films and racetracks with thickness gradient and interfacial Dzyaloshinskii-Moriya interaction at room temperature. We find that the electric field-induced directional motion of chiral domain wall is accompanied by the creation of skyrmion bubbles at certain conditions. We also demonstrate that the electric field variation can induce motion of skyrmion bubbles. Our findings may provide opportunities for developing skyrmion-based devices with ultralow power consumption.

    DOI PubMed

    Scopus

    103
    被引用数
    (Scopus)

  • Deterministic creation and deletion of a single magnetic skyrmion observed by direct time-resolved X-ray microscopy

    Seonghoon Woo, Kyung Mee Song, Xichao Zhang, Motohiko Ezawa, Yan Zhou, Xiaoxi Liu, Markus Weigand, Simone Finizio, Jörg Raabe, Min-Chul Park, Ki-Young Lee, Jun Woo Choi, Byoung-Chul Min, Hyun Cheol Koo, Joonyeon Chang

    Nature Electronics   1 ( 5 ) 288 - 296  2018年05月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

    Scopus

    113
    被引用数
    (Scopus)

  • Skyrmion dynamics in a frustrated ferromagnetic film and current-induced helicity locking-unlocking transition

    Xichao Zhang, Jing Xia, Yan Zhou, Xiaoxi Liu, Han Zhang, Motohiko Ezawa

    Nature Communications   8 ( 1 ) 1717  2017年12月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    The helicity-orbital coupling is an intriguing feature of magnetic skyrmions in frustrated magnets. Here we explore the skyrmion dynamics in a frustrated magnet based on the J(1)-J(2)-J(3) classical Heisenberg model explicitly by including the dipole-dipole interaction. The skyrmion energy acquires a helicity dependence due to the dipole-dipole interaction, resulting in the current-induced translational motion with a fixed helicity. The lowest-energy states are the degenerate Bloch-type states, which can be used for building the binary memory. By increasing the driving current, the helicity locking-unlocking transition occurs, where the translational motion changes to the rotational motion. Furthermore, we demonstrate that two skyrmions can spontaneously form a bound state. The separation of the bound state forced by a driving current is also studied. In addition, we show the annihilation of a pair of skyrmion and antiskyrmion. Our results reveal the distinctive frustrated skyrmions may enable viable applications in topological magnetism.

    DOI

    Scopus

    157
    被引用数
    (Scopus)

  • Motion of skyrmions in nanowires driven by magnonic momentum-transfer forces

    Xichao Zhang, Jan Müller, Jing Xia, Markus Garst, Xiaoxi Liu, Yan Zhou

    New Journal of Physics   19 ( 6 ) 065001 - 065001  2017年06月  [査読有り]  [招待有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

    Scopus

    57
    被引用数
    (Scopus)

  • Direct observation of the skyrmion Hall effect

    Wanjun Jiang, Xichao Zhang, Guoqiang Yu, Wei Zhang, Xiao Wang, M. Benjamin Jungfleisch, John E. Pearson, Xuemei Cheng, Olle Heinonen, Kang L. Wang, Yan Zhou, Axel Hoffmann, Suzanne G. E. te Velthuis

    Nature Physics   13 ( 2 ) 162 - 169  2017年02月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

    Scopus

    930
    被引用数
    (Scopus)

  • Magnetic Skyrmion Transport in a Nanotrack With Spatially Varying Damping and Non-adiabatic Torque

    Xichao Zhang, Jing Xia, G.P. Zhao, Xiaoxi Liu, Yan Zhou

    IEEE Transactions on Magnetics   53 ( 3 ) 1500206  2016年12月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

  • Control and manipulation of a magnetic skyrmionium in nanostructures

    Xichao Zhang, Jing Xia, Yan Zhou, Daowei Wang, Xiaoxi Liu, Weisheng Zhao, Motohiko Ezawa

    Physical Review B   94 ( 9 ) 094420  2016年09月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    A magnetic skyrmionium is a nontopological soliton, which has a doughnut-like out-of-plane spin texture in thin films, and can be phenomenologically viewed as a coalition of two topological magnetic skyrmions with opposite topological numbers. Due to its zero topological number (Q = 0) and doughnut-like structure, the skyrmionium has its distinctive characteristics as compared to the skyrmion with Q = +/- 1. Here we systematically study the generation, manipulation, and motion of a skyrmionium in ultrathin magnetic nanostructures by applying a magnetic field or a spin-polarized current. It is found that the skyrmionium moves faster than the skyrmion when they are driven by the out-of-plane current, and their velocity difference is proportional to the driving force. However, the skyrmionium and skyrmion exhibit an identical current-velocity relation when they are driven by the in-plane current. It is also found that a moving skyrmionium is less deformed in the current-in-plane geometry compared with the skyrmionium in the current-perpendicular-to-plane geometry. Furthermore we demonstrate the transformation of a skyrmionium with Q = 0 into two skyrmions with Q = +1 in a nanotrack driven by a spin-polarized current, which can be seen as the unzipping process of a skyrmionium. We illustrate the energy and spin structure variations during the skyrmionium unzipping process, where linear relations between the spin structure and energies are found. These results could have technological implications in the emerging field of skyrmionics.

    DOI

  • Thermally stable magnetic skyrmions in multilayer synthetic antiferromagnetic racetracks

    Xichao Zhang, Motohiko Ezawa, Yan Zhou

    Physical Review B   94 ( 6 ) 064406  2016年08月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    A magnetic skyrmion is a topological magnetization structure with a nanometric size and a well-defined swirling spin distribution, which is anticipated to be an essential building block for novel skyrmion-based device applications. We study the motion of magnetic skyrmions in multilayer synthetic antiferromagnetic (SAF) racetracks as well as in conventional monolayer ferromagnetic (FM) racetracks at finite temperature. There is an odd-even effect of the constituent FM layer number on the skyrmion Hall effect (SkHE). Namely, due to the suppression of the SkHE, the magnetic skyrmion has no transverse motion in multilayer SAF racetracks packed with even FM layers. It is shown that a moving magnetic skyrmion is stable even at room temperature (T = 300 K) in a bilayer SAF racetrack but it is destructed at T = 100 K in a monolayer FM racetrack. Our results indicate that the SAF structures are reliable and promising candidates for future applications in skyrmion electronics and skyrmion spintronics.

    DOI

  • Antiferromagnetic Skyrmion: Stability, Creation and Manipulation

    Xichao Zhang, Yan Zhou, Motohiko Ezawa

    Scientific Reports   6 ( 1 ) 24795  2016年04月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    Magnetic skyrmions are particle-like topological excitations in ferromagnets, which have the topological number Q = +/- 1, and hence show the skyrmion Hall effect (SkHE) due to the Magnus force effect originating from the topology. Here, we propose the counterpart of the magnetic skyrmion in the antiferromagnetic (AFM) system, that is, the AFM skyrmion, which is topologically protected but without showing the SkHE. Two approaches for creating the AFM skyrmion have been described based on micromagnetic lattice simulations: (i) by injecting a vertical spin-polarized current to a nanodisk with the AFM ground state; (ii) by converting an AFM domain-wall pair in a nanowire junction. It is demonstrated that the AFM skyrmion, driven by the spin-polarized current, can move straightly over long distance, benefiting from the absence of the SkHE. Our results will open a new strategy on designing the novel spintronic devices based on AFM materials.

    DOI

    Scopus

    322
    被引用数
    (Scopus)

  • High-topological-number magnetic skyrmions and topologically protected dissipative structure

    Xichao Zhang, Yan Zhou, Motohiko Ezawa

    Physical Review B   93 ( 2 ) 024415  2016年01月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    The magnetic skyrmion with the topological number of unity (Q = 1) is a well-known nanometric swirling spin structure in the nonlinear sigma model with the Dzyaloshinskii-Moriya interaction. Here we show that magnetic skyrmion with the topological number of two (Q = 2) can be created and stabilized by applying vertical spin-polarized current though it cannot exist as a static stable excitation. Magnetic skyrmion with Q = 2 is a nonequilibrium dynamic object, subsisting on a balance between the energy injection from the current and the energy dissipation by the Gilbert damping. Once it is created, it becomes a topologically protected object against fluctuations of various variables including the injected current itself. Hence we may call it a topologically protected dissipative structure. We also elucidate the nucleation and destruction mechanisms of the magnetic skyrmion with Q = 2 by studying the evolutions of the magnetization distribution, the topological charge density, as well as the energy density. Our results will be useful for the study of the nontrivial topology of magnetic skyrmions with higher topological numbers.

    DOI

  • Magnetic bilayer-skyrmions without skyrmion Hall effect

    Xichao Zhang, Yan Zhou, Motohiko Ezawa

    Nature Communications   7 ( 1 ) 10293  2016年01月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    Magnetic skyrmions might be used as information carriers in future advanced memories, logic gates and computing devices. However, there exists an obstacle known as the skyrmion Hall effect (SkHE), that is, the skyrmion trajectories bend away from the driving current direction due to the Magnus force. Consequently, the skyrmions in constricted geometries may be destroyed by touching the sample edges. Here we theoretically propose that the SkHE can be suppressed in the antiferromagnetically exchange-coupled bilayer system, since the Magnus forces in the top and bottom layers are exactly cancelled. We show that such a pair of SkHE-free magnetic skyrmions can be nucleated and be driven by the current-induced torque. Our proposal provides a promising means to move magnetic skyrmions in a perfectly straight trajectory in ultra-dense devices with ultra-fast processing speed.

    DOI

    Scopus

    447
    被引用数
    (Scopus)

  • Magnetic skyrmion transistor: skyrmion motion in a voltage-gated nanotrack

    Xichao Zhang, Yan Zhou, Motohiko Ezawa, G. P. Zhao, Weisheng Zhao

    Scientific Reports   5 ( 1 ) 11369  2015年06月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    Magnetic skyrmions are localized and topologically protected spin configurations, which are of both fundamental and applied interests for future electronics. In this work, we propose a voltage-gated skyrmion transistor within the well-established framework of micromagnetics. Its operating conditions and processes have been theoretically investigated and demonstrated, in which the gate voltage can be used to switch on/off a circuit. Our results provide the first time guidelines for practical realization of hybrid skyrmionic-electronic devices.

    DOI

    Scopus

    235
    被引用数
    (Scopus)

  • All-magnetic control of skyrmions in nanowires by a spin wave

    Xichao Zhang, Motohiko Ezawa, Dun Xiao, G P Zhao, Yaowen Liu, Yan Zhou

    Nanotechnology   26 ( 22 ) 225701  2015年05月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    　概要を見る

    Magnetic skyrmions are topologically protected nanoscale objects, which are promising building blocks for novel magnetic and spintronic devices. Here, we investigate the dynamics of a skyrmion driven by a spin wave in a magnetic nanowire. It is found that (i) the skyrmion is first accelerated and then decelerated exponentially; (ii) it can turn L-corners with both right and left turns; and (iii) it always turns left (right) when the skyrmion number is positive (negative) in the T-and Y-junctions. Our results will be the basis of skyrmionic devices driven by a spin wave.

    DOI

    Scopus

    116
    被引用数
    (Scopus)

  • Magnetic skyrmion logic gates: conversion, duplication and merging of skyrmions

    Xichao Zhang, Motohiko Ezawa, Yan Zhou

    Scientific Reports   5 ( 1 ) 9400  2015年03月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

    Scopus

    639
    被引用数
    (Scopus)

  • Skyrmion-skyrmion and skyrmion-edge repulsions in skyrmion-based racetrack memory

    Xichao Zhang, G. P. Zhao, Hans Fangohr, J. Ping Liu, W. X. Xia, J. Xia, F. J. Morvan

    Scientific Reports   5 ( 1 ) 7643  2015年01月  [査読有り]  [国際誌]  [国際共著]

    担当区分：筆頭著者

    DOI

    Scopus

    390
    被引用数
    (Scopus)

  • Micromagnetic simulation of Sm—Co/α-Fe/Sm—Co trilayers with various angles between easy axes and the film plane

    Xi-Chao Zhang, Guo-Ping Zhao, Jing Xia, Ming Yue, Xin-Hong Yuan, Lin-Hua Xie

    Chinese Physics B   23 ( 9 ) 097504  2014年07月  [査読有り]  [国際誌]

    担当区分：筆頭著者

    DOI

    Scopus

    14
    被引用数
    (Scopus)

  • Micromagnetic analysis of the maghemite platelet chains in the iron-mineral-based magnetoreceptor of birds

    Zhang Xi-Chao, Zhao Guo-Ping, Xia Jing

    Acta Physica Sinica   62 ( 21 ) 218702  2013年11月  [査読有り]

    担当区分：筆頭著者

    DOI

    Scopus

    3
    被引用数
    (Scopus)

  • Suppression of the skyrmion Hall effect in synthetic ferrimagnets with gradient magnetization

    Lan Bo, Xichao Zhang, Masahito Mochizuki, Xuefeng Zhang

    Physical Review Research   6 ( 2 ) 023199  2024年05月  [査読有り]  [国際誌]  [国際共著]

    　概要を見る

    Magnetic skyrmions are promising building blocks for future spintronic devices. However, the skyrmion Hall effect (SkHE) remains an obstacle for practical applications based on the in-line transport of skyrmions. Here, we numerically study the static properties and current-driven dynamics of synthetic ferrimagnetic skyrmions. Inspired by graded-index magnonics, we introduce a linear gradient of saturation magnetization (Ms) in the skyrmion-hosting sample, which effectively modulates the skyrmion Hall angle and suppresses the SkHE. Micromagnetic simulations reveal that ferrimagnetic skyrmions could exhibit greater susceptibility to the variation of Ms as compared to their ferromagnetic counterparts. The Thiele analysis is also applied to support the simulation results, which elucidates that the Ms gradient dynamically modifies the intrinsic normalized size of skyrmions, consequently impacting the SkHE. Our results pave the way to the graded-index skyrmionics, which offers novel insights for designing ferrimagnet-based skyrmionic devices.

    Published by the American Physical Society 2024

    DOI

  • Universal quantum computing based on magnetic domain-wall qubits

    Shuang Li, Xichao Zhang, Motohiko Ezawa, Yan Zhou

    Materials Today Quantum   2   100005 - 100005  2024年04月  [査読有り]  [招待有り]  [国際誌]  [国際共著]

    DOI

  • Transformation of a skyrmionium to a skyrmion through the thermal annihilation of the inner skyrmion

    Anjie Jiang, Yan Zhou, Xichao Zhang, Masahito Mochizuki

    Physical Review Research   6 ( 1 ) 013229  2024年03月  [査読有り]  [国際誌]  [国際共著]

    DOI

  • Global rotation of skyrmion bags under vertical microwave fields

    Lan Bo, Rongzhi Zhao, Xichao Zhang, Masahito Mochizuki, Xuefeng Zhang

    Journal of Applied Physics   135 ( 6 ) 063905  2024年02月  [査読有り]  [国際誌]  [国際共著]

    　概要を見る

    Magnetic skyrmion bags are composite topological spin textures with arbitrary topological charges. Here, we computationally study the transient rotational motion of skyrmion bags, which is characterized by a global rotation of inner skyrmions around the central point. Distinct from conventional rotational modes found in skyrmions, the observed rotation is a forced motion associated with the breathing mode induced solely by vertical microwave fields. The driving force behind this rotation originates from the interactions between outer and inner skyrmions, with the angular velocity determined by the phase difference resulting from their asynchronous breathing behaviors. It is also found that skyrmion bags with larger skyrmion numbers are more conducive to the occurrence of the rotation. Our results are useful for understanding the cluster dynamics of complex topological spin textures driven by dynamic fields.

    DOI

    Scopus

    2
    被引用数
    (Scopus)

  • Identifying and Exploring Synthetic Antiferromagnetic Skyrmions

    Yuelei Zhao, Sheng Yang, Kai Wu, Shuang Li, Yang Gao, Hongyuan Hao, Xichao Zhang, Shouguo Wang, Qingfang Liu, Senfu Zhang, Zhiqin Chu, Johan Åkerman, Yan Zhou

    Advanced Functional Materials   33   2303133  2023年12月

    　概要を見る

    Abstract

    Synthetic antiferromagnetic (SAF) skyrmions are emerging as novel information carriers due to their high mobility and lack of a skyrmion Hall effect. However, distinguishing SAF skyrmions from their ferromagnetic counterparts using imaging techniques like magneto‐optical microscopy remains challenging. While the suppressed intrinsic skyrmion Hall effect (SkHE) has been commonly used to identify SAF skyrmions, it is important to note that other factors such as defect pinning and dipolar interaction can also lead to a suppressed SkHE. Therefore, there is an urgent need for a universal identification method that can reliably differentiate SAF skyrmions from ferromagnetic ones. In this study, the generation of a SAF skyrmion within a standard SAF stack is demonstrated and its motion with almost no SkHE is investigated. Furthermore, a universal identification method is proposed wherein the application of an out‐of‐plane field allows the SAF skyrmion to be decoupled into two domains, which can either expand or contract with the application of an electric current. By expediting the development of a reliable means of identifying SAF skyrmions, these findings will accelerate the realization of practical applications based on these unique information carriers.

    DOI

    Scopus

    4
    被引用数
    (Scopus)

  • Topology-induced chiral photon emission from a large-scale meron lattice

    Xuefeng Wu, Xu Li, Wenyu Kang, Xichao Zhang, Li Chen, Zhibai Zhong, Yan Zhou, Johan Åkerman, Yaping Wu, Rong Zhang, Junyong Kang

    Nature Electronics   6 ( 7 ) 516 - 524  2023年07月  [査読有り]  [国際誌]  [国際共著]

    　概要を見る

    Abstract

    Merons are a class of topologically protected particle-like structures created in in-plane magnetized magnetic films. The structures can act as information carriers and could be used for magnetic storage. However, the development of such applications is hampered by limitations in the size, thermal stability and magnetic-field requirements of the systems. Here we report the construction of millimetre-scale meron lattices that are stable at room temperature and under zero magnetic field. Our system is based on a trilayer structure composed of a thin iron film sandwiched between films of palladium and magnesium oxide (Pd/Fe/MgO) on a gallium nitride wafer. It is fabricated using a molecular-beam epitaxy approach that is assisted by a high magnetic field, which leads to a strong Dzyaloshinskii–Moriya interaction. The lattices can be used for chirality transfer from merons to electrons and then to photons, and we show that the meron lattices can be used as spin injectors in nitride-based light-emitting diodes. The topology-induced spin light-emitting diode can provide 22.5% circularly polarized electroluminescence at room temperature and under zero magnetic field.

    DOI

    Scopus

    7
    被引用数
    (Scopus)

  • Controllable creation of skyrmion bags in a ferromagnetic nanodisk

    Lan Bo, Rongzhi Zhao, Chenglong Hu, Xichao Zhang, Xuefeng Zhang, Masahito Mochizuki

    Physical Review B   107 ( 22 ) 224431  2023年06月  [査読有り]  [国際誌]  [国際共著]

    DOI

  • Universal Quantum Computation Based on Nanoscale Skyrmion Helicity Qubits in Frustrated Magnets

    Jing Xia, Xichao Zhang, Xiaoxi Liu, Yan Zhou, Motohiko Ezawa

    Physical Review Letters   130 ( 10 )  2023年03月  [査読有り]  [国際誌]  [国際共著]

    DOI

  • Elimination of the skyrmion Hall effect by tuning perpendicular magnetic anisotropy and spin polarization angle

    J.H. Guo, Y. Hou, X. Zhang, Philip W.T. Pong, Y. Zhou

    Physics Letters A   456   128497 - 128497  2022年12月  [査読有り]  [国際誌]  [国際共著]

    DOI

    Scopus

    6
    被引用数
    (Scopus)

  • Systematic Control of the Interlayer Exchange Coupling in Perpendicularly Magnetized Synthetic Antiferromagnets

    Teng Xu, Jiahao Liu, Xichao Zhang, Qihan Zhang, Heng-An Zhou, Yiqing Dong, Pierluigi Gargiani, Manuel Valvidares, Yan Zhou, Wanjun Jiang

    Physical Review Applied   18 ( 5 )  2022年11月  [査読有り]  [国際誌]  [国際共著]

    DOI

  • Qubits based on merons in magnetic nanodisks

    Jing Xia, Xichao Zhang, Xiaoxi Liu, Yan Zhou, Motohiko Ezawa

    Communications Materials   3 ( 1 )  2022年11月  [査読有り]  [国際誌]  [国際共著]

    　概要を見る

    Abstract

    A meron is a classical topological soliton having a half topological charge. It could be materialized in a magnetic disk. However, it will become a quantum mechanical object when its size is of the order of nanometers. Here, we propose to use a nanoscale meron in a magnetic nanodisk as a qubit, where the up and down directions of the core spin are assigned to be the qubit states $$\left\vert 0\right\rangle$$ and $$\left\vert 1\right\rangle$$. We first numerically show that a meron with the radius containing as small as 7 spins can be stabilized in a ferromagnetic nanodisk classically. Then, we show theoretically that universal quantum computation is possible based on merons by explicitly constructing the arbitrary phase-shift gate, Hadamard gate, and CNOT gate. They are executed by applying a magnetic field or spin-polarized current. Our results may be useful for the implementation of quantum computation based on topological spin textures in nanomagnets.

    DOI

    Scopus

    21
    被引用数
    (Scopus)

  • Nonlinear dynamics of the topological helicity wave in a frustrated skyrmion string

    Jing Xia, Xichao Zhang, Xiaoxi Liu, Yan Zhou, Motohiko Ezawa

    Physical Review B   106 ( 5 ) 054414  2022年08月  [査読有り]  [国際誌]  [国際共著]

    DOI

  • Dynamics of magnetic skyrmions driven by a temperature gradient in a chiral magnet FeGe

    Gang Qin, Xichao Zhang, Ruixuan Zhang, Ke Pei, Chendi Yang, Chunyang Xu, Yan Zhou, Yizheng Wu, Haifeng Du, Renchao Che

    Physical Review B   106 ( 2 ) 024415  2022年07月  [査読有り]  [国際誌]  [国際共著]

    DOI

  • Controlling domain wall and field-free spin–orbit torque switching in synthetic antiferromagnets

    Yuelei Zhao, Sheng Yang, Kai Wu, Xiaoguang Li, Xichao Zhang, Li Li, Zhiqin Chu, Chong Bi, Yan Zhou

    Applied Physics Letters   120 ( 22 ) 222401 - 222401  2022年05月  [査読有り]  [国際誌]  [国際共著]

    　概要を見る

    Perpendicular magnetization switching driven by spin–orbit torques plays an increasingly important role for spintronic devices toward practical applications but is also hindered by the well-known technical challenge that an external in-plane magnetic field is required for deterministic switching. Here, we show that the deterministic switching can be achieved in synthetic antiferromagnets through the flexible domain control in the absence of external magnetic fields. Specifically, we have observed that the domain wall (DW) distorts under an applied electric current in contrast to the conventional rigid DW motion in a single ferromagnet. More importantly, the distorted DWs can be precisely controlled under zero magnetic field, leading to the deterministic switching. Our results indicate that the critical technical challenge may be addressed by employing a synthetic antiferromagnetic layer through the DW motion dominated field-free switching.

    DOI

    Scopus

    2
    被引用数
    (Scopus)

  • Mutual conversion between a magnetic Néel hopfion and a Néel toron

    Shuang Li, Jing Xia, Laichuan Shen, Xichao Zhang, Motohiko Ezawa, Yan Zhou

    Physical Review B   105 ( 17 ) 174407  2022年05月  [査読有り]  [国際誌]  [国際共著]

    DOI

  • Single-bit full adder and logic gate based on synthetic antiferromagnetic bilayer skyrmions

    Kai Yu Mak, Jing Xia, Xi-Chao Zhang, Li Li, Mouad Fattouhi, Motohiko Ezawa, Xiao-Xi Liu, Yan Zhou

    Rare Metals    2022年04月  [査読有り]  [招待有り]  [国際誌]  [国際共著]

    DOI

    Scopus

    8
    被引用数
    (Scopus)

  • Controlled Switching of the Number of Skyrmions in a Magnetic Nanodot by Electric Fields

    Zhipeng Hou, Yadong Wang, Xiaoming Lan, Sai Li, Xuejin Wan, Fei Meng, Yangfan Hu, Zhen Fan, Chun Feng, Minghui Qin, Min Zeng, Xichao Zhang, Xiaoxi Liu, Xuewen Fu, Guanghua Yu, Guofu Zhou, Yan Zhou, Weisheng Zhao, Xingsen Gao, Jun‐ming Liu

    Advanced Materials   34 ( 11 ) 2107908 - 2107908  2022年03月  [査読有り]  [国際誌]  [国際共著]

    DOI

    Scopus

    27
    被引用数
    (Scopus)

  • Dynamic properties of a ferromagnetic skyrmion in an in-plane magnetic field

    J. H. Guo, Y. Hou, J. Xia, X. Zhang, Philip W. T. Pong, Y. Zhou

    Journal of Applied Physics   131 ( 7 ) 073901 - 073901  2022年02月  [査読有り]  [国際誌]  [国際共著]

    DOI

    Scopus

    1
    被引用数
    (Scopus)

  • Nonreciprocal dynamics of ferrimagnetic bimerons

    Laichuan Shen, Jing Xia, Zehan Chen, Xiaoguang Li, Xichao Zhang, Oleg A. Tretiakov, Qiming Shao, Guoping Zhao, Xiaoxi Liu, Motohiko Ezawa, Yan Zhou

    Physical Review B   105 ( 1 ) 014422  2022年01月  [査読有り]  [国際誌]  [国際共著]

    DOI

  • Skyrmion Dynamics in the Presence of Deformation

    Zehan Chen, Xichao Zhang, Yan Zhou, Qiming Shao

    Physical Review Applied   17 ( 1 ) L011002  2022年01月  [査読有り]  [国際誌]  [国際共著]

    DOI

  • Dynamics of ferrimagnetic skyrmionium driven by spin-orbit torque

    Xue Liang, Xichao Zhang, Laichuan Shen, Jing Xia, Motohiko Ezawa, Xiaoxi Liu, Yan Zhou

    Physical Review B   104 ( 17 ) 174421  2021年11月  [査読有り]  [国際共著]

    DOI

  • Tunable Néel–Bloch Magnetic Twists in Fe3GeTe2 with van der Waals Structure

    Licong Peng, Fehmi S. Yasin, Tae‐Eon Park, Sung Jong Kim, Xichao Zhang, Takuro Nagai, Koji Kimoto, Seonghoon Woo, Xiuzhen Yu

    Advanced Functional Materials   31 ( 37 ) 2103583  2021年09月  [査読有り]  [国際共著]

    DOI

    Scopus

    43
    被引用数
    (Scopus)

  • Antiferromagnetic skyrmion-based logic gates controlled by electric currents and fields

    Xue Liang, Jing Xia, Xichao Zhang, Motohiko Ezawa, Oleg A. Tretiakov, Xiaoxi Liu, Lei Qiu, Guoping Zhao, Yan Zhou

    Applied Physics Letters   119 ( 6 ) 062403 - 062403  2021年08月  [査読有り]  [国際誌]  [国際共著]

    DOI

    Scopus

    53
    被引用数
    (Scopus)

  • Transcription and logic operations of magnetic skyrmions in bilayer cross structures

    Kai Yu Mak, Jing Xia, Xichao Zhang, Motohiko Ezawa, Xiaoxi Liu, Yan Zhou

    Journal of Physics: Condensed Matter   33 ( 40 ) 404001 - 404001  2021年07月  [査読有り]  [招待有り]  [国際誌]  [国際共著]

    DOI

  • Logic Gates Based on Synthetic Antiferromagnetic Bilayer Skyrmions

    Mouad Fattouhi, Kai Yu Mak, Yan Zhou, Xichao Zhang, Xiaoxi Liu, Mohamed El Hafidi

    Physical Review Applied   16 ( 1 ) 014040  2021年07月  [査読有り]  [国際誌]  [国際共著]

    DOI

  • Domain wall dynamics in ferromagnet/Ru/ferromagnet stacks with a wedged spacer

    Yuelei Zhao, Sheng Yang, Jing Xia, Xiaoguang Li, Kai Wu, Yuqing Zhou, Kaiquan Fan, Xichao Zhang, Yan Zhou

    Applied Physics Letters   119 ( 2 ) 022406 - 022406  2021年07月  [査読有り]  [国際誌]  [国際共著]

    DOI

    Scopus

    5
    被引用数
    (Scopus)

  • Néel-type skyrmions and their current-induced motion in van der Waals ferromagnet-based heterostructures

    Tae-Eon Park, Licong Peng, Jinghua Liang, Ali Hallal, Fehmi Sami Yasin, Xichao Zhang, Kyung Mee Song, Sung Jong Kim, Kwangsu Kim, Markus Weigand, Gisela Schütz, Simone Finizio, Jörg Raabe, Karin Garcia, Jing Xia, Yan Zhou, Motohiko Ezawa, Xiaoxi Liu, Joonyeon Chang, Hyun Cheol Koo, Young Duck Kim, Mairbek Chshiev, Albert Fert, Hongxin Yang, Xiuzhen Yu, Seonghoon Woo

    Physical Review B   103 ( 10 )  2021年03月  [査読有り]  [国際誌]  [国際共著]

    　概要を見る

    Since the discovery of ferromagnetic two-dimensional (2D) van der Waals (vdW) crystals, significant interest on such 2D magnets has emerged, inspired by their appealing physical properties and integration with other 2D family for unique heterostructures. In known 2D magnets, spin-orbit coupling (SOC) stabilizes perpendicular magnetic anisotropy down to one or a few monolayers. Such a strong SOC could also lift the chiral degeneracy, leading to the formation of topological magnetic textures such as skyrmions through the Dzyaloshinskii-Moriya interaction (DMI). Here, we report the experimental observation of Neel-type chiral magnetic skyrmions and their lattice (SkX) formation in a vdW ferromagnet Fe3GeTe2 (FGT). We demonstrate the ability to drive an individual skyrmion by short current pulses along a vdW heterostructure, FGT/h-BN, as highly required for any skyrmion-based spintronic device. Using first principle calculations supported by experiments, we unveil the origin of DMI being the interfaces with oxides, which then allows us to engineer vdW heterostructures for desired chiral states. Our finding opens the door to topological spin textures in the 2D vdW magnet and their potential device application.

    DOI

  • Interlayer coupling effect on skyrmion dynamics in synthetic antiferromagnets

    Lei Qiu, Laichuan Shen, Xichao Zhang, Yan Zhou, Guoping Zhao, Weixing Xia, Hu-Bin Luo, J. Ping Liu

    Applied Physics Letters    2021年02月

    DOI

    Scopus

    10
    被引用数
    (Scopus)

  • Magnetic skyrmions for unconventional computing

    Sai Li, Wang Kang, Xichao Zhang, Tianxiao Nie, Yan Zhou, Kang L. Wang, Weisheng Zhao

    Materials Horizons    2021年

    DOI

  • A ferromagnetic skyrmion-based nano-oscillator with modified perpendicular magnetic anisotropy

    J.H. Guo, J. Xia, X. Zhang, Philip W.T. Pong, Y. Zhou

    Physics Letters A     127157 - 127157  2021年01月

    DOI

    Scopus

    14
    被引用数
    (Scopus)

  • Bimeron clusters in chiral antiferromagnets

    Xiaoguang Li, Laichuan Shen, Yuhao Bai, Junlin Wang, Xichao Zhang, Jing Xia, Motohiko Ezawa, Oleg A. Tretiakov, Xiaohong Xu, Michal Mruczkiewicz, Maciej Krawczyk, Yongbing Xu, Richard F. L. Evans, Roy W. Chantrell, Yan Zhou

    npj Computational Materials   6 ( 1 )  2020年12月

    　概要を見る

    A magnetic bimeron is an in-plane topological counterpart of a magnetic skyrmion. Despite the topological equivalence, their statics and dynamics could be distinct, making them attractive from the perspectives of both physics and spintronic applications. In this work, we demonstrate the stabilization of bimeron solitons and clusters in the antiferromagnetic (AFM) thin film with interfacial Dzyaloshinskii-Moriya interaction (DMI). Bimerons demonstrate high current-driven mobility as generic AFM solitons, while featuring anisotropic and relativistic dynamics excited by currents with in-plane and out-of-plane polarizations, respectively. Moreover, these spin textures can absorb other bimeron solitons or clusters along the translational direction to acquire a wide range of Neel topological numbers. The clustering involves the rearrangement of topological structures, and gives rise to remarkable changes in static and dynamical properties. The merits of AFM bimeron clusters reveal a potential path to unify multibit data creation, transmission, storage, and even topology-based computation within the same material system, and may stimulate spintronic devices enabling innovative paradigms of data manipulations.

    DOI

    Scopus

    39
    被引用数
    (Scopus)

  • Magnetic skyrmionium diode with a magnetic anisotropy voltage gating

    Junlin Wang, Jing Xia, Xichao Zhang, Xiangyu Zheng, Guanqi Li, Li Chen, Yan Zhou, Jing Wu, Haihong Yin, Roy Chantrell, Yongbing Xu

    Applied Physics Letters    2020年11月

    DOI

    Scopus

    40
    被引用数
    (Scopus)

  • Dynamics of ferromagnetic bimerons driven by spin currents and magnetic fields

    Laichuan Shen, Xiaoguang Li, Jing Xia, Lei Qiu, Xichao Zhang, Oleg A. Tretiakov, Motohiko Ezawa, Yan Zhou

    Physical Review B   102 ( 10 )  2020年09月

    　概要を見る

    A magnetic bimeron composed of two merons is a topological counterpart of a magnetic skyrmion in in-plane magnets, which can be used as the nonvolatile information carrier in spintronic devices. Here we analytically and numerically study the dynamics of ferromagnetic bimerons driven by spin currents and magnetic fields. Numerical simulations demonstrate that two bimerons with opposite signs of topological numbers can be created simultaneously in a ferromagnetic thin film via current-induced spin torques. The current-induced spin torques can also drive the bimeron and its speed is analytically derived, which agrees with the numerical results. Since the bimerons with opposite topological numbers can coexist and have opposite drift directions, two-lane racetracks can be built to accurately encode the data bits. In addition, the dynamics of bimerons induced by magnetic field gradients and alternating magnetic fields are investigated. It is found that the bimeron driven by alternating magnetic fields can propagate along a certain direction. Moreover, combining a suitable magnetic field gradient, the Magnus-force-induced transverse motion can be completely suppressed, which implies that there is no skyrmion Hall effect. Our results are useful for understanding the bimeron dynamics and may provide guidelines for building future bimeron-based spintronic devices.

    DOI

    Scopus

    24
    被引用数
    (Scopus)

  • Electric-field-driven non-volatile multi-state switching of individual skyrmions in a multiferroic heterostructure

    Yadong Wang, Lei Wang, Jing Xia, Zhengxun Lai, Guo Tian, Xichao Zhang, Zhipeng Hou, Xingsen Gao, Wenbo Mi, Chun Feng, Min Zeng, Guofu Zhou, Guanghua Yu, Guangheng Wu, Yan Zhou, Wenhong Wang, Xi-xiang Zhang, Junming Liu

    Nature Communications   11 ( 1 )  2020年07月

    DOI

    Scopus

    137
    被引用数
    (Scopus)

  • Realization of isolated and high-density skyrmions at room temperature in uncompensated synthetic antiferromagnets

    Ruyi Chen, Yang Gao, Xichao Zhang, Ruiqi Zhang, Siqi Yin, Xianzhe Chen, Xiaofeng Zhou, Yongjian Zhou, Jing Xia, Yan Zhou, Shouguo Wang, Feng Pan, Ying Zhang, Cheng Song

    Nano Letters    2020年04月

    DOI

    Scopus

    51
    被引用数
    (Scopus)

  • A spiking neuron constructed by the skyrmion-based spin torque nano-oscillator

    Xue Liang, Xichao Zhang, Jing Xia, Motohiko Ezawa, Yuelei Zhao, Guoping Zhao, Yan Zhou

    Applied Physics Letters    2020年03月

    DOI

    Scopus

    44
    被引用数
    (Scopus)

  • Skyrmion-based artificial synapses for neuromorphic computing

    Kyung Mee Song, Jae-Seung Jeong, Biao Pan, Xichao Zhang, Jing Xia, Sunkyung Cha, Tae-Eon Park, Kwangsu Kim, Simone Finizio, Jörg Raabe, Joonyeon Chang, Yan Zhou, Weisheng Zhao, Wang Kang, Hyunsu Ju, Seonghoon Woo

    Nature Electronics   3 ( 3 ) 148 - 155  2020年03月  [査読有り]  [国際誌]  [国際共著]

    DOI

    Scopus

    400
    被引用数
    (Scopus)

  • Direct imaging of an inhomogeneous electric current distribution using the trajectory of magnetic half-skyrmions

    Senfu Zhang, Xichao Zhang, Junwei Zhang, Arnab Ganguly, Jing Xia, Yan Wen, Qiang Zhang, Guoqiang Yu, Zhipeng Hou, Wenhong Wang, Yong Peng, Gang Xiao, Aurelien Manchon, Jürgen Kosel, Yan Zhou, Xi-Xiang Zhang

    Science Advances   6 ( 6 )  2020年02月

    DOI

    Scopus

    22
    被引用数
    (Scopus)

  • A ferromagnetic skyrmion-based nano-oscillator with modified profile of Dzyaloshinskii-Moriya interaction

    J.H. Guo, J. Xia, X.C. Zhang, Philip W.T. Pong, Y.M. Wu, H. Chen, W.S. Zhao, Y. Zhou

    Journal of Magnetism and Magnetic Materials   496   165912 - 165912  2020年02月

    DOI

    Scopus

    31
    被引用数
    (Scopus)

  • Current-Induced Dynamics and Chaos of Antiferromagnetic Bimerons

    Laichuan Shen, Jing Xia, Xichao Zhang, Motohiko Ezawa, Oleg A. Tretiakov, Xiaoxi Liu, Guoping Zhao, Yan Zhou

    Physical Review Letters    2020年01月

    DOI

    Scopus

    99
    被引用数
    (Scopus)

  • A Comparative Cross-layer Study on Racetrack Memories

    Wang Kang, Bi Wu, Xing Chen, Daoqian Zhu, Zhaohao Wang, Xichao Zhang, Yan Zhou, Youguang Zhang, Weisheng Zhao

    ACM Journal on Emerging Technologies in Computing Systems   16 ( 1 ) 1 - 17  2019年10月

    DOI

    Scopus

    18
    被引用数
    (Scopus)

  • Dynamics of an antiferromagnetic skyrmion in a racetrack with a defect

    Xue Liang, Guoping Zhao, Laichuan Shen, Jing Xia, Li Zhao, Xichao Zhang, Yan Zhou

    Physical Review B   100 ( 14 )  2019年10月

    DOI

  • Dynamics of antiskyrmions induced by the voltage-controlled magnetic anisotropy gradient

    Lei Qiu, Jing Xia, Youhua Feng, Laichuan Shen, Francois J. Morvan, Xichao Zhang, Xiaoxi Liu, Linhua Xie, Yan Zhou, Guoping Zhao

    Journal of Magnetism and Magnetic Materials     165922 - 165922  2019年09月

    DOI

    Scopus

    18
    被引用数
    (Scopus)

  • Magnetic Skyrmion Spectrum Under Voltage Excitation and its Linear Modulation

    Xing Chen, Wang Kang, Daoqian Zhu, Na Lei, Xichao Zhang, Yan Zhou, Youguang Zhang, Weisheng Zhao

    Physical Review Applied   12 ( 2 )  2019年08月

    DOI

  • Nd-Fe-B films with perpendicular magnetic anisotropy and extremely large room temperature coercivity

    Chuang Ma, Jing Xia, Xichao Zhang, Yan Zhou, Akimitsu Morisako, S.N. Piramanayagam, Xiaoxi Liu

    Journal of Magnetism and Magnetic Materials   474   406 - 410  2019年03月

    DOI

    Scopus

    5
    被引用数
    (Scopus)

  • An achiral ferromagnetic/chiral antiferromagnetic bilayer system leading to controllable size and density of skyrmions

    F. J. Morvan, H. B. Luo, H. X. Yang, X. Zhang, Y. Zhou, G. P. Zhao, W. X. Xia, J. P. Liu

    Scientific Reports   9 ( 1 )  2019年02月

    DOI

    Scopus

    10
    被引用数
    (Scopus)

  • Spin torque nano-oscillators based on antiferromagnetic skyrmions

    Laichuan Shen, Jing Xia, Guoping Zhao, Xichao Zhang, Motohiko Ezawa, Oleg A. Tretiakov, Xiaoxi Liu, Yan Zhou

    Applied Physics Letters    2019年01月

    DOI

    Scopus

    125
    被引用数
    (Scopus)

  • Voltage-Driven High-Speed Skyrmion Motion in a Skyrmion-Shift Device

    Yizheng Liu, Na Lei, Chengxiang Wang, Xichao Zhang, Wang Kang, Daoqian Zhu, Yan Zhou, Xiaoxi Liu, Youguang Zhang, Weisheng Zhao

    Physical Review Applied   11 ( 1 )  2019年01月

    DOI

  • A skyrmion-based spin-torque nano-oscillator with enhanced edge

    Youhua Feng, Jing Xia, Lei Qiu, Xinran Cai, Laichuan Shen, Francois J. Morvan, Xichao Zhang, Yan Zhou, Guoping Zhao

    Journal of Magnetism and Magnetic Materials   491   165610 - 165610  2019年

    DOI

    Scopus

    40
    被引用数
    (Scopus)

  • Current-driven dynamics and inhibition of the skyrmion Hall effect of ferrimagnetic skyrmions in GdFeCo films

    Seonghoon Woo, Kyung Mee Song, Xichao Zhang, Yan Zhou, Motohiko Ezawa, Xiaoxi Liu, S. Finizio, J. Raabe, Nyun Jong Lee, Sang-Il Kim, Seung-Young Park, Younghak Kim, Jae-Young Kim, Dongjoon Lee, OukJae Lee, Jun Woo Choi, Byoung-Chul Min, Hyun Cheol Koo, Joonyeon Chang

    Nature Communications   9 ( 1 )  2018年12月

    　概要を見る

    Magnetic skyrmions are swirling magnetic textures with novel characteristics suitable for future spintronic and topological applications. Recent studies confirmed the room-temperature stabilization of skyrmions in ultrathin ferromagnets. However, such ferromagnetic skyrmions show an undesirable topological effect, the skyrmion Hall effect, which leads to their current-driven motion towards device edges, where skyrmions could easily be annihilated by topographic defects. Recent theoretical studies have predicted enhanced current-driven behavior for antiferromagnetically exchange-coupled skyrmions. Here we present the stabilization of these skyrmions and their current-driven dynamics in ferrimagnetic GdFeCo films. By utilizing element-specific X-ray imaging, we find that the skyrmions in the Gd and FeCo sublayers are antiferromagnetically exchange-coupled. We further confirm that ferrimagnetic skyrmions can move at a velocity of similar to 50 m s(-1) with reduced skyrmion Hall angle, |theta(SkHE)| similar to 20 degrees. Our findings open the door to ferrimagnetic and antiferromagnetic skyrmionics while providing key experimental evidences of recent theoretical studies.

    DOI

    Scopus

    317
    被引用数
    (Scopus)

  • Dynamics of the antiferromagnetic skyrmion induced by a magnetic anisotropy gradient

    Laichuan Shen, Jing Xia, Guoping Zhao, Xichao Zhang, Motohiko Ezawa, Oleg A. Tretiakov, Xiaoxi Liu, Yan Zhou

    Physical Review B   98 ( 13 )  2018年10月

    DOI

  • Complementary Skyrmion Racetrack Memory Enables Voltage-Controlled Local Data Update Functionality

    Xing Chen, Wang Kang, Daoqian Zhu, Xichao Zhang, Na Lei, Youguang Zhang, Yan Zhou, Weisheng Zhao

    IEEE Transactions on Electron Devices     1 - 7  2018年10月

    DOI

    Scopus

    6
    被引用数
    (Scopus)

  • Strain-controlled skyrmion creation and propagation in ferroelectric/ferromagnetic hybrid wires

    Zhi Li, Youguang Zhang, Yangqi Huang, Chengxiang Wang, Xichao Zhang, Yan Liu, Yan Zhou, Wang Kang, Shradha Chandrashekhar Koli, Na Lei

    Journal of Magnetism and Magnetic Materials   455   19 - 24  2018年06月

    DOI

    Scopus

    39
    被引用数
    (Scopus)

  • Controllable transport of a skyrmion in a ferromagnetic narrow channel with voltage-controlled magnetic anisotropy

    Junlin Wang, Jing Xia, Xichao Zhang, G P Zhao, Lei Ye, Jing Wu, Yongbing Xu, Weisheng Zhao, Zhigang Zou, Yan Zhou

    Journal of Physics D: Applied Physics   51 ( 20 ) 205002 - 205002  2018年05月

    DOI

    Scopus

    20
    被引用数
    (Scopus)

  • Dynamics of a magnetic skyrmionium driven by spin waves

    Sai Li, Jing Xia, Xichao Zhang, Motohiko Ezawa, Wang Kang, Xiaoxi Liu, Yan Zhou, Weisheng Zhao

    Applied Physics Letters   112 ( 14 )  2018年04月

    　概要を見る

    A magnetic skyrmionium is a skyrmion-like structure, but carries a zero net skyrmion number which can be used as a building block for non-volatile information processing devices. Here, we study the dynamics of a magnetic skyrmionium driven by propagating spin waves. It is found that the skyrmionium can be effectively driven into motion by spin waves showing a tiny skyrmion Hall effect, whose mobility is much better than that of the skyrmion at the same condition. We also show that the skyrmionium mobility depends on the nanotrack width and the damping coefficient and can be controlled by an external out-of-plane magnetic field. In addition, we demonstrate that the skyrmionium motion driven by spin waves is inertial. Our results indicate that the skyrmionium is a promising building block for building spin-wave spintronic devices. Published by AIP Publishing.

    DOI

    Scopus

    55
    被引用数
    (Scopus)

  • Skyrmions in magnetic tunnel junctions

    Xueying Zhang, Wenlong Cai, Xichao Zhang, Zilu Wang, Zhi Li, Yu Zhang, Kaihua Cao, Na Lei, Wang Kang, Yue Zhang, Haiming Yu, Yan Zhou, Weisheng Zhao

    ACS Applied Materials & Interfaces    2018年04月

    DOI

    Scopus

    66
    被引用数
    (Scopus)

  • Vortical structures for nanomagnetic memory induced by dipole-dipole interaction in monolayer disks

    Zhaosen Liu, Orion Ciftja, Xichao Zhang, Yan Zhou, Hou Ian

    Superlattices and Microstructures    2018年03月

    DOI

    Scopus

    6
    被引用数
    (Scopus)

  • Dynamics of Magnetic Skyrmion Clusters Driven by Spin-Polarized Current With a Spatially Varied Polarization

    Wenjing Jiang, Jing Xia, Xichao Zhang, Yifan Song, Chuang Ma, Hans Fangohr, Guoping Zhao, Xiaoxi Liu, Weisheng Zhao, Yan Zhou

    IEEE Magnetics Letters   9   1 - 5  2018年

    DOI

    Scopus

    10
    被引用数
    (Scopus)

  • Skyrmions-based magnetic racetrack memory

    Liang Xue, Zhao Li, Qiu Lei, Li Shuang, Ding Li-Hong, Feng You-Hua, Zhang Xi-Chao, Zhou Yan, Zhao Guo-Ping

    Acta Physica Sinica   67 ( 13 ) 137510 - 137510  2018年

    DOI

    Scopus

    9
    被引用数
    (Scopus)

  • A compact skyrmionic leaky-integrate-fire spiking neuron device

    Xing Chen, Kang Wang, Daoqian Zhu, Xichao Zhang, Na Lei, Youguang Zhang, Yan Zhou, Weisheng Zhao

    Nanoscale    2018年

    DOI

    Scopus

    94
    被引用数
    (Scopus)

  • Overview of magnetic skyrmion-based devices and applications

    Xia Jing, Han Zong-Yi, Song Yi-Fan, Jiang Wen-Jing, Lin Liu-Rong, Zhang Xi-Chao, Liu Xiao-Xi, Zhou Yan

    Acta Physica Sinica   67 ( 13 ) 137505 - 137505  2018年

    DOI

    Scopus

    7
    被引用数
    (Scopus)

  • Skyrmion dynamics in width-varying nanotracks and implications for skyrmionic applications

    Xing Chen, Wang Kang, Daoqian Zhu, Xichao Zhang, Na Lei, Youguang Zhang, Yan Zhou, Weisheng Zhao

    Applied Physics Letters   111 ( 20 ) 202406 - 202406  2017年11月

    DOI

    Scopus

    30
    被引用数
    (Scopus)

  • A microwave field-driven transistor-like skyrmionic device with the microwave current-assisted skyrmion creation

    Jing Xia, Yangqi Huang, Xichao Zhang, Wang Kang, Chentian Zheng, Xiaoxi Liu, Weisheng Zhao, Yan Zhou

    Journal of Applied Physics   122 ( 15 ) 153901 - 153901  2017年10月

    DOI

    Scopus

    29
    被引用数
    (Scopus)

  • Magnetic domain wall engineering in a nanoscale permalloy junction

    Junlin Wang, Xichao Zhang, Xianyang Lu, Jason Zhang, Yu Yan, Hua Ling, Jing Wu, Yan Zhou, Yongbing Xu

    Applied Physics Letters   111 ( 7 ) 072401 - 072401  2017年08月

    DOI

    Scopus

    19
    被引用数
    (Scopus)

  • Magnetic skyrmion-based artificial neuron device

    Sai Li, Wang Kang, Yangqi Huang, Xichao Zhang, Yan Zhou, Weisheng Zhao

    Nanotechnology   28 ( 31 )  2017年07月

    DOI

    Scopus

    176
    被引用数
    (Scopus)

  • Creation, transport and detection of imprinted magnetic solitons stabilized by spin-polarized current

    R.P. Loreto, W.A. Moura-Melo, A.R. Pereira, X. Zhang, Y. Zhou, M. Ezawa, C.I.L. Araujo

    Journal of Magnetism and Magnetic Materials    2017年04月

    DOI

    Scopus

    18
    被引用数
    (Scopus)

  • An Improved Racetrack Structure for Transporting a Skyrmion

    P. Lai, G. P. Zhao, H. Tang, N. Ran, S. Q. Wu, J. Xia, X. Zhang, Y. Zhou

    Scientific Reports   7   45330 - 45330  2017年03月

    DOI

    Scopus

    98
    被引用数
    (Scopus)

  • Magnetic skyrmion-based synaptic devices

    Yangqi Huang, Wang Kang, Xichao Zhang, Yan Zhou, Weisheng Zhao

    Nanotechnology    2017年02月

    DOI

    Scopus

    245
    被引用数
    (Scopus)

  • The influence of the edge effect on the skyrmion generation in a magnetic nanotrack

    N. Ran, G. P. Zhao, H. Tang, L. C. Shen, P. Lai, J. Xia, X. Zhang, Y. Zhou

    AIP Advances   7 ( 2 ) 025105 - 025105  2017年02月

    DOI

    Scopus

    17
    被引用数
    (Scopus)

  • Skyrmion Racetrack Memory With Random Information Update/Deletion/Insertion

    Daoqian Zhu, Wang Kang, Sai Li, Yangqi Huang, Xichao Zhang, Yan Zhou, Weisheng Zhao

    IEEE Transactions on Electron Devices     1 - 9  2017年

    DOI

  • Compact Modeling and Evaluation of Magnetic Skyrmion-Based Racetrack Memory

    Wang Kang, Chentian Zheng, Yangqi Huang, Xichao Zhang, Weifeng Lv, Yan Zhou, Weisheng Zhao

    IEEE Transactions on Electron Devices     1 - 9  2017年

    DOI

  • Skyrmion-Electronics: An Overview and Outlook

    Kang, Wang, Huang, Yangqi, Zhang, Xichao, Zhou, Yan, Zhao, Weisheng

    Proceedings of the IEEE   104 ( 10 )  2016年

    DOI

    Scopus

    306
    被引用数
    (Scopus)

  • Voltage controlled magnetic skyrmion motion for racetrack memory

    Kang, Wang, Huang, Yangqi, Zheng, Chentian, Lv, Weifeng, Lei, Na, Zhang, Youguang, Zhang, Xichao, Zhou, Yan, Zhao, Weisheng

    Scientific Reports   6   23164 - 23164  2016年

    DOI

    Scopus

    195
    被引用数
    (Scopus)

  • Spin-Cherenkov effect in a magnetic nanostrip with interfacial Dzyaloshinskii-Moriya interaction

    Xia, Jing, Zhang, Xichao, Yan, Ming, Zhao, Weisheng, Zhou, Yan

    Scientific Reports   6   25189 - 25189  2016年

    DOI

    Scopus

    11
    被引用数
    (Scopus)

  • Hysteresis of misaligned hard-soft grains

    Wan, X. L., Zhao, G. P., Zhang, X. F., Xia, J., Zhang, Xichao, Morvan, F. J.

    Journal of Magnetism and Magnetic Materials   397  2016年

    DOI

    Scopus

    4
    被引用数
    (Scopus)

  • Effect of exchange coupling on magnetic property in Sm-Co/α-Fe layered system

    Sang, C. X., Zhao, G. P., Xia, W. X., Wan, X. L., Morvan, F. J., Zhang, Xichao, Xie, L. H., Zhang, J., Du, J., Yan, A. R., Liu, P.

    Chinese Physics B   25 ( 3 ) 037501 - 037501  2016年

    DOI

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    10
    被引用数
    (Scopus)

  • Complementary skyrmion racetrack memory with voltage manipulation

    Kang, Wang, Zheng, Chentian, Huang, Yangqi, Zhang, Xichao, Zhou, Yan, Lv, Weifeng, Zhao, Weisheng

    IEEE Electron Device Letters   37 ( 7 ) 924 - 924  2016年

    DOI

  • Skyrmion spin structure of exchange-coupled magnetic core-shell nanodisk

    Xia, Jing, Zhang, Xichao, Morvan, F. J., Zhao, G. P., Zhou, Yan

    IEEE Transactions on Magnetics   51 ( 11 )  2015年

    DOI

    Scopus

    1
    被引用数
    (Scopus)

  • Simulation of spin-torque diode microwave detectors

    Cao, Chong Long, Zhou, Yan, Zhang, Xichao, Wu, Yu Mao, Pong, Philip W.T.

    The European Physical Journal Applied Physics   69 ( 1 ) 10603 - 10603  2015年

    DOI

    Scopus

    1
    被引用数
    (Scopus)

  • Hysteresis loops, critical fields and energy products for exchange-spring hard/soft/hard trilayers

    Chen, B. Z., Yan, S., Ju, Y. Z., Zhao, G. P., Zhang, Xichao, Yue, M., Xia, J.

    Journal of Magnetics   20 ( 1 ) 31 - 31  2015年

    DOI

    Scopus

    1
    被引用数
    (Scopus)

  • Micromagnetic analysis of the effect of the easy axis orientation on demagnetization process in Nd2Fe14B/α-Fe bilayers

    Xia, Jing, Zhang, Xichao, Zhao, G. P.

    Acta Physica Sinica   62   227502 - 227502  2013年

    DOI

    Scopus

    6
    被引用数
    (Scopus)

  • 3D and 1D calculation of hysteresis loops and energy products for anisotropic nanocomposite films with perpendicular anisotropy

    Yuan, X. H., Zhao, G. P., Yue, M., Ye, L. N., Xia, J., Zhang, Xichao, Chang, J.

    Journal of Magnetism and Magnetic Materials   343   245 - 245  2013年

    DOI

    Scopus

    30
    被引用数
    (Scopus)

▼全件表示

書籍等出版物

  • Magnetic Skyrmions and Their Applications

    Xichao Zhang, Jing Xia, Laichuan Shen, Motohiko Ezawa, Xiaoxi Liu, Yan Zhou( 担当： 分担執筆,  担当範囲: Chapter 13: Conventional Applications of Skyrmions)

    Elsevier  2021年06月  [査読有り]

    DOI

  • Magnetic Skyrmions and Their Applications

    Xichao Zhang, Yan Zhou, Seonghoon Woo( 担当： 分担執筆,  担当範囲: Chapter 10: Skyrmions in ferrimagnets)

    Elsevier  2021年06月  [査読有り]

    DOI

  • Skyrmions: Topological Structures, Properties, and Applications

    Xichao Zhang, Jing Xia, Guoping Zhao, Hans Fangohr, Motohiko Ezawa, Yan Zhou( 担当： 分担執筆,  担当範囲: Chapter 12: Racetrack-Type Applications of Magnetic Skyrmions)

    CRC Press  2016年12月  [査読有り]

    DOI

  • Chirality, magnetism and magnetoelectricity: separate phenomena and Joint effects in metamaterial structures

    Laichuan Shen, Xue Liang, Jing Xia, Xichao Zhang, Motohiko Ezawa, Oleg A. Tretiakov, Yan Zhou( 担当： 分担執筆,  担当範囲: Chapter 16: Antiferromagnetic Skyrmions and Bimerons)

    Springer  2021年03月 ISBN: 9783030628437  [査読有り]

    DOI

  • Skyrmions: Topological Structures, Properties, and Applications

    Guoping Zhao, Nian Ran, Ping Lai, François Jacques Morvan, Jing Xia, Xichao Zhang, Yan Zhou( 担当： 分担執筆,  担当範囲: Chapter 14: Skyrmions in Other Condensed Matter Systems)

    CRC Press  2016年12月  [査読有り]

    DOI

講演・口頭発表等

  • Dynamics of topological spin textures

    Xichao Zhang  [招待有り]

    The International Conference on New Frontiers in Advanced Magnetism (NFAM-2024)   (Sapporo)  Hokkaido University  

    発表年月： 2024年08月

    開催年月：
    2024年08月
    　
    　

  • Topological Spin Textures in Frustrated Magnetic Systems

    Xichao Zhang  [招待有り]

    EEMD 2022  

    発表年月： 2022年11月

  • Frustrated magnetic skyrmions : from two dimensions to three dimensions

    Xichao Zhang[国際共著]

    第46回日本磁気学会学術講演会  

    発表年月： 2022年09月

    開催年月：
    2022年09月
    　
    　

  • Frustrated Skyrmions and Bimerons

    Xichao Zhang  [招待有り]

    The IEEE Around-the-Clock Around-the-Globe Magnetics Conference 2022  

    発表年月： 2022年08月

    開催年月：
    2022年08月
    　
    　

    　概要を見る

    Skyrmions and bimerons are typical topological spin textures that can be stabilized in frustrated magnetic systems with competing exchange interactions [1]. They have multiple degrees of freedom, which could be manipulated by external driving forces and thus, may lead to novel applications, such as the helicity-based information processing in nanoscale devices. Therefore, it is important to understand the fundamental physical properties of frustrated skyrmions and bimerons, and to explore their potential applications.In this talk, I will first briefly introduce topological spin textures in magnetic systems [2]. I will then talk about the static and dynamic properties of isolated skyrmions and bimerons in a magnetic monolayer with frustrated exchange interactions [3]. I will focus on the discussion of the dynamic behaviors of isolated skyrmions and bimerons driven by spin torques, including linear motion, elliptical motion, and rotation. Besides, I will discuss the current-induced dynamics of a three-dimensional skyrmion string in a frustrated multilayer system [4]. Finally, at the end of the talk, I will share some views on possible future directions for the study of topological spin textures, which are not limited to the frustrated magnetic systems.

  • Configurable Pixelated Skyrmions on Nanoscale Grids

    Xichao Zhang[国際共著]

    The 2022 Joint MMM-INTERMAG Conference  

    発表年月： 2022年01月

    開催年月：
    2022年01月
    　
    　

  • Configurable pixelated skyrmions on nanoscale grids

    Xichao Zhang

    第45回日本磁気学会学術講演会  

    発表年月： 2021年08月

    開催年月：
    2021年08月
    -
    2021年09月

  • Frustrated magnetic skyrmions and bimerons

    Xichao Zhang

    The 2021 IEEE International Magnetics Conference (INTERMAG2021)  

    発表年月： 2021年04月

    開催年月：
    2021年04月
    　
    　

  • Frustrated magnetic skyrmions and bimerons

    Xichao Zhang  [招待有り]

    SKYMAG 2021  

    発表年月： 2021年04月

    開催年月：
    2021年03月
    -
    2021年04月

  • Static structures and dynamics of frustrated bimerons

    Xichao Zhang

    第44回日本磁気学会学術講演会  

    発表年月： 2020年12月

    開催年月：
    2020年12月
    　
    　

  • Frustrated magnetic skyrmions in a monolayer thin film

    Xichao Zhang  [招待有り]

    The 19th IEEE International Conference on Nanotechnology (IEEENANO2019)  

    発表年月： 2019年07月

    開催年月：
    2019年07月
    　
    　

  • Dynamics of skyrmions in a frustrated magnetic film driven by spin current

    Xichao Zhang

    第79回応用物理学会秋季学術講演会  

    発表年月： 2018年09月

    開催年月：
    2018年09月
    　
    　

  • Current-induced skyrmion dynamics in a frustrated magnetic film

    Xichao Zhang

    The 2018 IEEE International Magnetics Conference (INTERMAG2018)  

    発表年月： 2018年04月

    開催年月：
    2018年04月
    　
    　

  • Synthetic antiferromagnetic skyrmions

    Xichao Zhang  [招待有り]

    Tsinghua University, Department of Physics  

    発表年月： 2016年12月

  • Configurable Pixelated Skyrmions on Nanoscale Grids

    Xichao Zhang[国際共著]

    The 24th International Colloquium on Magnetic Films and Surfaces (ICMFS-2022)  

    発表年月： 2022年07月

    開催年月：
    2022年07月
    　
    　

  • Topological spin textures in frustrated magnetic systems

    Xichao Zhang  [招待有り]

    South China Normal University, South China Academy of Advanced Optoelectronics  

    発表年月： 2020年07月

  • Topological spin textures in frustrated magnetic systems

    Xichao Zhang  [招待有り]

    Sichuan Normal University, College of Physics and Electronic Engineering  

    発表年月： 2020年07月

  • Magnetic skyrmions in novel materials and nanostructures

    Xichao Zhang  [招待有り]

    The Chinese Academy of Sciences, High Magnetic Field Laboratory  

    発表年月： 2019年12月

  • Magnetic skyrmions in novel materials and nanostructures

    Xichao Zhang  [招待有り]

    Anhui University, Institutes of Physical Science and Information Technology  

    発表年月： 2019年12月

  • Magnetic skyrmions in novel materials and nanostructures

    Xichao Zhang  [招待有り]

    Sichuan Normal University, School of Physics and Electronic Engineering  

    発表年月： 2019年07月

  • Frustrated magnetic skyrmions in monolayer and bilayer thin films

    Xichao Zhang  [招待有り]

    UESTC Spintronics Mini Workshop 2019  

    発表年月： 2019年06月

    開催年月：
    2019年06月
    　
    　

  • Magnetic skyrmions in nanostructures and their applications

    Xichao Zhang  [招待有り]

    South China Normal University, South China Academy of Advanced Optoelectronics  

    発表年月： 2018年11月

  • Magnetic skyrmions in nanostructures and their applications

    Xichao Zhang  [招待有り]

    Sichuan Normal University, School of Physics and Electronic Engineering  

    発表年月： 2018年10月

  • Magnetic skyrmion Hall effect and methods for eliminating skyrmion Hall effect

    Xichao Zhang  [招待有り]

    The Chinese Physical Society 2017 Fall Meeting  

    発表年月： 2017年09月

    開催年月：
    2017年09月
    　
    　

  • Magnetic skyrmion logic gates

    Xichao Zhang

    The 28th Magnetic Recording Conference (TMRC2017)  

    発表年月： 2017年08月

    開催年月：
    2017年08月
    　
    　

  • Magnetic skyrmion logic gates

    Xichao Zhang

    UESTC Spintronics Mini Workshop 2017  

    発表年月： 2017年05月

    開催年月：
    2017年05月
    　
    　

  • Synthetic antiferromagnetic skyrmions

    Xichao Zhang  [招待有り]

    The 10th International Conference on Computational Physics (ICCP10)  

    発表年月： 2017年01月

    開催年月：
    2017年01月
    　
    　

  • Synthetic antiferromagnetic skyrmions

    Xichao Zhang  [招待有り]

    Sichuan Normal University, School of Physics and Electronic Engineering  

    発表年月： 2016年12月

  • Synthetic antiferromagnetic skyrmions

    Xichao Zhang  [招待有り]

    The 2016 Forum on Novel Magnetic States, Materials and Devices  

    発表年月： 2016年12月

    開催年月：
    2016年12月
    　
    　

  • Synthetic antiferromagnetic skyrmions

    Xichao Zhang  [招待有り]

    Beihang University, Spintronics Interdisciplinary Center  

    発表年月： 2016年12月

  • Magnetic skyrmions in bilayer and multilayer nanotracks

    Xichao Zhang

    第77回応用物理学会秋季学術講演会  

    発表年月： 2016年09月

    開催年月：
    2016年09月
    　
    　

  • All-magnetic control of magnetic skyrmions in a nanowire by spin waves

    Xichao Zhang

    The Gordon Research Conference (GRC) on Spin Dynamics in Nanostructures  

    発表年月： 2015年07月

    開催年月：
    2015年07月
    　
    　

  • Voltage-gated skyrmion transistor

    Xichao Zhang

    The 2015 IEEE International Magnetics Conference (INTERMAG2015)  

    発表年月： 2015年05月

    開催年月：
    2015年05月
    　
    　

  • All-magnetic control of magnetic skyrmions in a nanowire by spin waves

    Xichao Zhang

    The 9th International Conference on Computational Physics (ICCP9)  

    発表年月： 2015年01月

    開催年月：
    2015年01月
    　
    　

  • All-magnetic control of magnetic skyrmions in a nanowire by spin waves

    Xichao Zhang

    International Workshop on Simulation and Modeling of Emerging Electronics   The University of Hong Kong  

    発表年月： 2014年12月

    開催年月：
    2014年12月
    　
    　

▼全件表示

共同研究・競争的資金等の研究課題

  • トポロジカルスピンテキスチャーに基づくメモリ・論理計算・ニューラルネットワーク

    日本学術振興会  科学研究費助成事業 特別研究員奨励費

    研究期間:

    2020年11月
    -
    2023年03月
     

    劉 小晰, ZHANG XICHAO

Misc

 

学術貢献活動

  • Guest Editor

    Materials Today Quantum (ISSN: 2950-2578)  

    2024年02月
    -
    継続中

    　概要を見る

    【論文募集】

    MATERIALS TODAY QUANTUM誌で特集号を企画しています。
    みなさんからの投稿を大歓迎します。

    特集のテーマ：スピントロニクスとトポロジカル磁性
    ゲストエディタ：Yan Zhou (CUHKSZ), Johan Åkerman (東北大・ヨーテボリ大), Xichao Zhang (早大)
    投稿締切予定：２０２４年８月１日

    https://www.sciencedirect.com/journal/materials-today-quantum/about/call-for-papers

    CALL FOR PAPERS

    MATERIALS TODAY QUANTUM (ISSN: 2950-2578)
    Spintronics and Topological Magnetism
    https://www.sciencedirect.com/journal/materials-today-quantum/about/call-for-papers

    Guest Editors
    Yan Zhou (CUHKSZ), Johan Åkerman (Gothenburg/Tohoku), Xichao Zhang (Waseda)

    Submission Deadline: August 1, 2024

    All submissions on topics relevant to spintronics, magnetism, and topology are welcome!

  • Associate Editor

    Frontiers in Physics (ISSN: 2296-424X)  

    2023年09月
    -
    継続中

    　概要を見る

    Your research is welcome. Submit your work here:
    https://www.frontiersin.org/journals/physics

  • Editorial Board Member

    Magnetism (ISSN: 2673-8724)  

    2021年06月
    -
    継続中

    　概要を見る

    Your research is welcome. Submit your work here:
    https://www.mdpi.com/journal/magnetism

  • Guest Editor

    Journal of Magnetism and Magnetic Materials  

    2022年01月
    -
    2022年11月

  • Guest Editor

    Magnetism (ISSN: 2673-8724)  

    2021年06月
    -
    2022年09月

  • Topic Editor

    Frontiers in Physics (ISSN: 2296-424X)  

    2020年12月
    -
    2022年08月

▼全件表示