Current-Induced Nucleation and Annihilation of Magnetic Skyrmions at Room Temperature in a Chiral Magnet

Xiuzhen Yu, Daisuke Morikawa, Yusuke Tokunaga, Masashi Kubota, Takashi Kurumaji, Hiroshi Oike, Masao Nakamura, Fumitaka Kagawa, Yasujiro Taguchi, Taka Hisa Arima, Masashi Kawasaki, Yoshinori Tokura

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

A magnetic skyrmion is a nanometer-scale magnetic vortex carrying an integer topological charge. Skyrmions show a promise for potential application in low-power-consumption and high-density memory devices. To promote their use in applications, it is attempted to control the existence of skyrmions using low electric currents at room temperature (RT). This study presents real-space observations for the current-induced formation and annihilation of a skyrmion lattice (SkL) as well as isolated skyrmions in a microdevice composed of a thin chiral magnet Co8Zn9Mn3 with a Curie temperature, TC ≈ 325 K, above RT. It is found that the critical current for the manipulation of Bloch-type skyrmions is on the order of 108 A m−2, approximately three orders of magnitude lower than that needed for the creation and drive of ferromagnetic (FM) domain walls in thin FM films. The in situ real-space imaging also demonstrates the dynamical topological transition from a helical or conical structure to a SkL induced by the flow of DC current, thus paving the way for the electrical control of magnetic skyrmions.

Original languageEnglish
Article number1606178
JournalAdvanced Materials
Volume29
Issue number21
DOIs
Publication statusPublished - 2017 Jun 6
Externally publishedYes

Keywords

  • DC current
  • chiral magnets
  • nucleation of skyrmions
  • spintronics

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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