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Dynamics of magnetic skyrmion clusters driven by spin-polarized current with a spatially varied polarization

Research paper by Wenjing Jiang, Jing Xia, Xichao Zhang, Yifan Song, Chuang Ma, Hans Fangohr, G. P. Zhao, Xiaoxi Liu, Yan Zhou

Indexed on: 26 Jan '18Published on: 26 Jan '18Published in: arXiv - Physics - Mesoscopic Systems and Quantum Hall Effect



Abstract

Magnetic skyrmions are promising candidates for future information technology. Here, we present a micromagnetic study of isolated skyrmions and skyrmion clusters in a ferromagnetic nanodisk driven by the spin-polarized current with spatially varied polarization. The current-driven skyrmion clusters can be either dynamic steady or static, depending on the spatially varied polarization profile. For the dynamic steady state, the skyrmion cluster rotates in the nanodisk, while for the static state, the skyrmion cluster can be compressed or destroyed. The oscillation frequency of skyrmion clusters is also studied. Furthermore, the dependence of the skyrmion cluster dynamics on the magnetic anisotropy and Dzyaloshinskii-Moriya interaction is investigated. Our results may provide a pathway to realize magnetic skyrmion cluster based devices.