期刊
PHYSICAL REVIEW LETTERS
卷 125, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.027206
关键词
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资金
- Basic Science Center Project of NSFC [51788104]
- National Key RAMP
- D Program of China [2017YFA0206200, 2016YFA0302300]
- National Natural Science Foundation of China [11774194, 51831005, 1181131008, 1181101082, 11974298, 61961136006]
- Beijing Natural Science Foundation [Z190009]
- Tsinghua University Initiative Scientific Research Program
- Beijing Advanced Innovation Center for Future Chip (ICFC)
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110713]
- Presidential Postdoctoral Fellowship of The Chinese University of Hong Kong, Shenzhen (CUHKSZ)
- President's Fund of CUHKSZ
- Longgang Key Laboratory of Applied Spintronics
- Shenzhen Fundamental Research Fund [JCYJ20170410171958839]
- Shenzhen Peacock Group Plan [KQTD20180413181702403]
Noninteracting particles exhibiting Brownian motion have been observed in many occasions of sciences, such as molecules suspended in liquids, optically trapped microbeads, and spin textures in magnetic materials. In particular, a detailed examination of Brownian motion of spin textures is important for designing thermally stable spintronic devices, which motivates the present study. In this Letter, through using temporally and spatially resolved polar magneto-optic Kerr effect microscopy, we have experimentally observed the thermal fluctuation-induced random walk of a single isolated Neel-type magnetic skyrmion in an interfacially asymmetric Ta/CoFeB/TaOx multilayer. An intriguing topology-dependent Brownian gyromotion behavior of skyrmions has been identified. The onset of Brownian gyromotion of a single skyrmion induced by thermal effects, including a nonlinear temperature-dependent diffusion coefficient and topology-dependent gyromotion are further formulated based on the stochastic Thiele equation. The experimental and numerical demonstration of topology-dependent Brownian gyromotion of skyrmions can be useful for understanding the nonequilibrium magnetization dynamics and implementing spintronic devices.
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