Magnetic vortex induced by nonmagnetic impurity in ferromagnets: Magnetic multipole and toroidal around the vacancy

Satoru Hayami, Hiroaki Kusunose, Yukitoshi Motome

研究成果: Article査読

1 被引用数 (Scopus)

抄録

We report our theoretical study on nucleation of a magnetic vortex around a nonmagnetic impurity doped into ferromagnets. The mechanism lies in the asymmetric Dzyaloshinskii–Moriya interaction arising from the breaking of spatial inversion symmetry by the impurity. By using the spin-wave analysis and Monte Carlo simulations, we show that the asymmetric interaction induces a magnetic vortex with nonzero vorticity l = +1. The vortex is stabilized even for less frustration in exchange interactions and in the absence of an external magnetic field. We also find that the magnetic vortex is characterized by magnetic multipoles according to its vorticity and helicity. We demonstrate a potential realization of such a magnetic vortex by considering a monolayer ferromagnet on a nonmagnetic substrate, which results in the magnetic monopole and toroidal dipole.

本文言語English
論文番号063702-
ジャーナルJournal of the Physical Society of Japan
88
6
DOI
出版ステータスPublished - 1 1 2019

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