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

Satoru Hayami, Hiroaki Kusunose, Yukitoshi Motome

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1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number063702-
JournalJournal of the Physical Society of Japan
Volume88
Issue number6
DOIs
Publication statusPublished - 1 Jan 2019

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