論文

査読有り
2018年8月

Aggregation and collapse dynamics of skyrmions in a non-equilibrium state

NATURE PHYSICS
  • Xiuzhen Yu
  • ,
  • Daisuke Morikawa
  • ,
  • Tomoyuki Yokouchi
  • ,
  • Kiyou Shibata
  • ,
  • Naoya Kanazawa
  • ,
  • Fumitaka Kagawa
  • ,
  • Taka-hisa Arima
  • ,
  • Yoshinori Tokura

14
8
開始ページ
832
終了ページ
+
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1038/s41567-018-0155-3
出版者・発行元
NATURE PUBLISHING GROUP

Magnetic skyrmions have attracted attention because of their emergent electromagnetic properties. In particular, non-equilibrium-state skyrmions, which are protected by topology and hence can exist over a wider temperature-magnetic-field region, show promise for possible practical applications, but their dynamics remain elusive. Here, we report the observation of a magnetic-field-induced dynamical transition from the metastable hexagonal-lattice skyrmion crystal (SkX) at a zero bias-field to an amorphous state via the densely vacancy-populated SkX. With decreasing field, on the other hand, the aggregate transforms from 'random particles' to 'microcrystals' of skyrmions in a non-equilibrium state, in analogy to colloidal crystallization, and subsequently undergoes a topologically distinct phase separation between the SkX and helical/conical domains accompanied by topological defects. These observations directly demonstrate the aggregation and collapse dynamics of metastable skyrmions and may provide a route to other nontrivial topological phenomena such as the zero-magnetic-field topological Hall effect.

Web of Science ® 被引用回数 : 12

リンク情報
DOI
https://doi.org/10.1038/s41567-018-0155-3
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000440583300018&DestApp=WOS_CPL

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