Discretized topological Hall effect emerging from skyrmions in constricted geometry
Discretized topological Hall effect emerging from skyrmions in constricted geometry
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DOI：
10.1103/physrevb.91.041122
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发表时间：
2015-01-28
影响因子：
3.7
通讯作者：
Tokura, Y.
中科院分区：
文献类型：
--
作者：
Kanazawa, N.;Kubota, M.;Tokura, Y.
我们通过测量拓扑霍尔效应来研究纳米结构 FeGe 霍尔棒器件中斯格明子的形成过程，该效应提取自旋纹理的缠绕数作为涌现磁场。在改变施加磁场的过程中观察到拓扑霍尔电阻率的逐步分布，这是由磁性纳米结构的瞬时变化（例如斯格明子的产生、湮灭和抖动运动）引起的。拓扑霍尔电阻率的离散变化证明了每个斯格明子固有的涌现磁通量的量子化性质，这在宏观尺度上在许多斯格明子系统中是无法区分的。
We investigate the skyrmion formation process in nanostructured FeGe Hall-bar devices by measurements of the topological Hall effect, which extracts the winding number of a spin texture as an emergent magnetic field. Stepwise profiles of the topological Hall resistivity are observed in the course of varying the applied magnetic field, which arise from instantaneous changes in the magnetic nanostructure such as the creation, annihilation, and jittering motion of skyrmions. The discrete changes in the topological Hall resistivity demonstrate the quantized nature of an emergent magnetic flux inherent in each skyrmion, which had been indistinguishable in many-skyrmion systems on a macroscopic scale.