Deformation of Topologically-Protected Supercooled Skyrmions in a Thin Plate of Chiral Magnet Co8Zn8Mn4

Daisuke Morikawa, Xiuzhen Yu, Kosuke Karube, Yusuke Tokunaga, Yasujiro Taguchi, Taka hisa Arima, Yoshinori Tokura

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Magnetic skyrmions in Co8Zn8Mn4 thin plates are observed to deform in a metastable state prepared in a magnetic-field-cooling process by way of the thermal-equilibrium skyrmion phase. In cooling, the disk-shape skyrmions change to bar- or L-shaped elongated form, whereas the skyrmion density is nearly conserved. The deformation of the skyrmions in the supercooled metastable phase is observed irrespective of the crystallographic orientation of the thin plate, whereas the elongation direction nearly aligns along the magnetic easy axis. It is proposed that the deformation should be induced by a large increase in magnetic modulation wavenumber when decreasing the temperature, whereas the topological protection of the skyrmions keeps the averaged skyrmion density constant.

Original languageEnglish
Pages (from-to)1637-1641
Number of pages5
JournalNano Letters
Volume17
Issue number3
DOIs
Publication statusPublished - 2017 Mar 8
Externally publishedYes

Keywords

  • Lorentz transmission electron microscopy
  • Skyrmion
  • chiral magnet
  • magnetic-field cooling
  • metastable state
  • topological protection

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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