Stochastic skyrmion dynamics under alternating magnetic fields
Stochastic skyrmion dynamics under alternating magnetic fields
复制标题
交变磁场下的随机斯格明子动力学
DOI：
10.1016/j.jmmm.2021.167974
复制
发表时间：
2021
影响因子：
2.7
通讯作者：
Suzuki Yoshishige
中科院分区：
文献类型：
--
作者：
Goto Minori;Nomura Hikaru;Suzuki Yoshishige
磁Skyrmions是一种拓扑自旋纹理，由于其多样的物理特性而引起了人们的极大关注。最近，各种应用利用布朗运动的skyrmions已被报道。然而，Skyrmions的扩散被磁性薄膜中的钉扎位点抑制，这会限制计算速度。本文研究了在垂直交变磁场作用下Skyrmions的随机动力学和扩散系数。随着交流磁场的增加，由于弦状skyrmion的拉伸运动，skyrmion的扩散系数呈指数增加。该研究为实现低功耗布朗器件提供了技术框架。
Magnetic skyrmions are topological spin textures that have attracted significant attention owing to their diverse physical characteristics. Recently, various applications utilizing the Brownian motion of skyrmions have been reported. However, the diffusion of skyrmions is suppressed by pinning sites in magnetic thin films, which can limit computing speed. In this paper, we explore the stochastic dynamics and diffusion coefficient of skyrmions under a perpendicular alternating current (AC) magnetic field. The skyrmion diffusion coefficient increased exponentially as the AC magnetic field was increased owing to the stretching motion of the string-shaped skyrmions. This study may provide a technological framework for the realization of low-power-consumption Brownian devices.