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  • Letter

Asymmetrical magnetic domain wall motion in symmetrical heavy metal/ferromagnet multilayers

Maokang Shen1,2,*, Xiangyu Li2,*, Long You2, Xiaofei Yang2, Wei Luo2, and Yue Zhang2,†

  • 1School of Physics and Optoelectronics, Xiangtan University, Xiangtan, China
  • 2School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China

  • *These authors contributed equally to this work.
  • †yue-zhang@hust.edu.cn
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Phys. Rev. B 105, L140402 – Published 27 April, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L140402

Abstract

In a heavy metal (HM)/ferromagnet (FM)/HM multilayer with a symmetrical sandwich structure, the absence of an interfacial Dzyaloshinskii-Moriya interaction (iDMI) is generally expected. A zero iDMI constant is usually verified by the motion of a magnetic domain wall (DW) with a velocity that is symmetrical to the longitudinal magnetic field (symmetrical DW motion). However, asymmetrical DW motion was still experimentally observed in a symmetrical HM/FM/HM multilayer, and its mechanism is unclear. In this letter, we theoretically prove that even in a perfectly symmetrical HM/FM/HM multilayer with a zero total iDMI constant, asymmetrical DW motion is still possible owing to the exchange coupling between the neighboring FM atomic layers in the FM medium. This work paves a way to unraveling unique DW motion in HM/FM multilayers from a deep perspective of the subtle magnetic interactions within a FM medium.

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Phys. Rev. B 105, L140402– Published 27 April, 2022
  • Received 18 October 2021
  • Revised 20 February 2022
  • Accepted 13 April 2022
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