Current-induced skyrmion dynamics in constricted geometries

Junichi Iwasaki, Masahito Mochizuki, Naoto Nagaosa

Research output: Contribution to journalArticle

370 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)742-747
Number of pages6
JournalNature Nanotechnology
Volume8
Issue number10
DOIs
Publication statusPublished - 2013
Externally publishedYes

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Induced currents
Magnetoelectronics
Geometry
geometry
swirling
Domain walls
Electric currents
Motion control
electric current
Magnets
domain wall
Vortex flow
Current density
magnets
vortices
current density
simulation

ASJC Scopus subject areas

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

Cite this

Current-induced skyrmion dynamics in constricted geometries. / Iwasaki, Junichi; Mochizuki, Masahito; Nagaosa, Naoto.

In: Nature Nanotechnology, Vol. 8, No. 10, 2013, p. 742-747.

Research output: Contribution to journalArticle

Iwasaki, Junichi ; Mochizuki, Masahito ; Nagaosa, Naoto. / Current-induced skyrmion dynamics in constricted geometries. In: Nature Nanotechnology. 2013 ; Vol. 8, No. 10. pp. 742-747.
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