Journal
PHYSICAL REVIEW B
Volume 105, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.105.L140402
Keywords
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Funding
- National Key Research and Development Program of China [2022YFE0103300]
- National Natural Science Foundation of China [51971098]
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In this study, we theoretically demonstrate that asymmetrical DW motion can still occur in a perfectly symmetrical HM/FM/HM multilayer with a zero total iDMI constant due to the exchange coupling between the neighboring FM atomic layers in the FM medium.
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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