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  • Letter

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

Xichao Zhang1,*, Jing Xia2,*, Oleg A. Tretiakov3, Hung T. Diep4, Guoping Zhao5, Jinbo Yang6, Yan Zhou2,†, Motohiko Ezawa7,‡, and Xiaoxi Liu1,§

  • 1Department of Electrical and Computer Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
  • 2School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China
  • 3School of Physics, The University of New South Wales, Sydney 2052, Australia
  • 4Laboratoire de Physique Théorique et Modélisation, CY Cergy Paris Université, 95302 Cergy-Pontoise Cedex, France
  • 5College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, China
  • 6State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
  • 7Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-8656, Japan

  • *These authors contributed equally to this work.
  • †zhouyan@cuhk.edu.cn
  • ‡ezawa@ap.t.u-tokyo.ac.jp
  • §liu@cs.shinshu-u.ac.jp
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Phys. Rev. B 104, L220406 – Published 15 December, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L220406

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 Néel-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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Phys. Rev. B 104, L220406– Published 15 December, 2021
  • Received 3 August 2021
  • Accepted 2 December 2021
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