Current-driven dynamics of skyrmions in the presence of pinning at finite temperatures
Current-driven dynamics of skyrmions in the presence of pinning at finite temperatures
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DOI：
10.1016/j.jmmm.2022.169786
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Hao Yu
中科院分区：
文献类型：
--
作者：
Yunxi Jiang;Chen Xuan;Hao Yu
Magnetic skyrmions are topological solitons in magnetic materials with broken spatial inversion symmetry. They offer potential as an information carrier for future low-power memory and computing systems owing to the small size and relatively low driving current compared to traditional devices. To develop applications such as racetrack memory at ambient temperature, the interaction of current-driven motion, pinning and thermal fluctuations must be investigated. The skyrmion dynamics at finite temperatures are shown using the expanded Thiele equation, and the relationship between critical depinning current and temperature is established with regard to different damping constants. Furthermore, we found that the Thiele equation still can not describe the dynamics of skyrmion precisely at low temperatures with the presence of pinning. Moreover, we have shown that the skyrmion Hall angle is dependent on the driving current in the presence of the pinning effect at various finite temperatures. • The interplay of pinning centers, thermal fluctuations and skyrmions. • Thermal fluctuations may suppress the pinning effect for some parameters. • The dependence of critical depinning current on temperature varies in terms of different Gilbert damping constants. • Skyrmion Hall angle depends on temperature, damping constant, and pinning potentials.
