Symmetry of spin–orbit torque induced meron annihilation

Electrical manipulation of the topological charges of magnetic vortices is of vital importance for the development of vortex-based devices. Here, we show that the spin–orbit torque (SOT) effect can be employed to deterministically and selectively annihilate the vortex core, and this process exhibits...

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Bibliographic Details
Published inApplied physics letters Vol. 124; no. 8
Main Authors Jiang, Siyuan, Gao, Nan
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 19.02.2024
Subjects
Symmetry
Topology
Torque
Vortices
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Summary:Electrical manipulation of the topological charges of magnetic vortices is of vital importance for the development of vortex-based devices. Here, we show that the spin–orbit torque (SOT) effect can be employed to deterministically and selectively annihilate the vortex core, and this process exhibits a symmetry that is consistent with that of the SOT-induced magnetization switching in perpendicularly magnetized systems. By changing the SOT current pulse direction, it is also possible to write back a vortex with random topological charges from the quasi-single-domain state after annihilation. These intriguing results can be utilized as a random topological charge generator and applied in stochastic computing where a tunable random stream source plays a central role.
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ISSN:0003-6951
1077-3118
DOI:10.1063/5.0188618