journal article·2021-12-15Open access

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· Volume 104· Issue 22

Abstract

Frustrated topological spin textures have unique properties that may enable novel spintronic applications, such as helicity-based information storage and computing. Here, we report the statics and current-induced dynamics of two-dimensional (2D) pancake skyrmions in a stack of weakly coupled frustrated magnetic monolayers, which form a three-dimensional (3D) skyrmion string. The Bloch-type skyrmion string is energetically more stable than its N\'eel-type counterpart. It can be driven into translational motion by the dampinglike spin-orbit torque and shows the damping-dependent skyrmion Hall effect. Most notably, the skyrmion string can be transformed to a dynamically stable bimeron string by the dampinglike spin-orbit torque. The current-induced bimeron string rotates stably with respect to its center, which can spontaneously transform back to a skyrmion string when the current is switched off. Our results reveal unusual physical properties of 3D frustrated spin textures, and may open up different possibilities for spintronic applications based on skyrmion and bimeron strings.
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Research context

OpenAlex topics: Magnetic properties of thin films · Advanced Condensed Matter Physics · Physics of Superconductivity and Magnetism

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Electrical and Computer Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan

School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China

School of Physics, The University of New South Wales, Sydney 2052, Australia

Laboratoire de Physique Théorique et Modélisation, CY Cergy Paris Université, 95302 Cergy-Pontoise Cedex, France

College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, China

State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China

Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-8656, Japan

Funding

Japan Society for the Promotion of Science · National Natural Science Foundation of China · Australian Research Council · Russian Science Foundation · Core Research for Evolutional Science and Technology · Japan Science and Technology Agency · Guangdong Special Support Project · Shenzhen Fundamental Research Fund · Shenzhen Peacock Group Plan · Pearl River Recruitment Program of Talents

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