Current-induced skyrmion dynamics in constricted geometries

Junichi Iwasaki, Masahito Mochizuki, Naoto Nagaosa

研究成果: Article査読

470 被引用数 (Scopus)

抄録

Magnetic skyrmions - vortex-like swirling spin structures with a quantized topological number that are observed in chiral magnets - are appealing for potential applications in spintronics because it is possible to control their motion with ultralow current density. To realize skyrmion-based spintronic devices, it is essential to understand skyrmion motions in confined geometries. Here we show by micromagnetic simulations that the current-induced motion of skyrmions in the presence of geometrical boundaries is very different from that in an infinite plane. In a channel of finite width, transverse confinement results in steady-state characteristics of the skyrmion velocity as a function of current that are similar to those of domain walls in ferromagnets, whereas the transient behaviour depends on the initial distance of the skyrmion from the boundary. Furthermore, we show that a single skyrmion can be created by an electric current in a simple constricted geometry comprising a plate-shaped specimen of suitable size and geometry. These findings could guide the design of skyrmion-based devices in which skyrmions are used as information carriers.

本文言語English
ページ(範囲)742-747
ページ数6
ジャーナルNature Nanotechnology
8
10
DOI
出版ステータスPublished - 2013 10
外部発表はい

ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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