Collective modes of three-dimensional magnetic structures: A study of target skyrmions

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:489

Article

Booth, Alexander C.¹  Liu, Yizhou^2,3  Zang, Jiadong¹ 

[1] Univ New Hampshire, Dept Phys & Astron, Durham, NH 03824 USA

[2] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[3] Univ Calif Riverside, Dept Elect & Comp Engn, Riverside, CA 92507 USA

关键词: Skyrmion;    Magnetic resonance;   

DOI  :  10.1016/j.jmmm.2019.165447

来源: Elsevier

【 摘 要 】

Three-dimensional magnetic textures present their richness not only in variety of ground state structures, but also in their dazzling collective modes. As an example, the target skyrmion, a topological spin texture with a central skyrmion and an extra concentric helical ring, has been enabled by confining a chiral magnet in a nanodisk geometry. In this work we investigate the collective spin wave modes of the target skyrmion in the external field region of - 400 mT to 400 mT. Through micromagnetic simulations we reproduced three major phases of the target skyrmion, and derived resonance modes at varying external magnetic field by the power spectral density study. All typical modes were resolved in terms of their dynamical snapshots in temporal domain and the corresponding spatial Fourier transformations. Some modes are shown to behave similarly in-plane but differently out-of-plane, and vice versa. This suggests, on a broader scope, that both responses will be necessary to fully characterize collective modes of three-dimensional spin textures.

【 授权许可】

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