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

研究成果: Article査読

32 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号1606178
ジャーナルAdvanced Materials
29
21
DOI
出版ステータスPublished - 2017 6 6
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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