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<p>The formation and characteristics of magnetic skyrmions are strongly governed by the symmetry of the underlying crystal structure. In this study, we report the discovery of a new trigonal polymorph of Cu<sub>2</sub>OSeO<sub>3</sub>, observed exclusively in nanoparticles. Electron diffraction and density functional theory calculations confirm its <i>R</i>3m space group, sharing C<sub>3v</sub> symmetry with Néel-type skyrmion hosts. This polymorph is likely stabilized by surface effects, suggesting that size-induced structural changes may drive a transformation from Bloch-type to Néel-type skyrmions in Cu<sub>2</sub>OSeO<sub>3</sub>. This hypothesis could be consistent with prior unexplained observations of Néel-type skyrmions at the surfaces of bulk crystals, which may result from surface-specific structural distortions<b>.</b> Overall, these findings provide insights into the interplay between size, structure, and magnetism, opening pathways for controlling skyrmionic properties in nanoscale systems.</p>

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Cu2OSeO3 turns trigonal with structural transformation and implications for skyrmions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月30日

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  • Alla Arakcheeva,
  • Priya Ranjan Baral,
  • Wen Hua Bi,
  • Christian Jandl,
  • Oleg Janson,
  • Arnaud Magrez

摘要

The formation and characteristics of magnetic skyrmions are strongly governed by the symmetry of the underlying crystal structure. In this study, we report the discovery of a new trigonal polymorph of Cu2OSeO3, observed exclusively in nanoparticles. Electron diffraction and density functional theory calculations confirm its R3m space group, sharing C3v symmetry with Néel-type skyrmion hosts. This polymorph is likely stabilized by surface effects, suggesting that size-induced structural changes may drive a transformation from Bloch-type to Néel-type skyrmions in Cu2OSeO3. This hypothesis could be consistent with prior unexplained observations of Néel-type skyrmions at the surfaces of bulk crystals, which may result from surface-specific structural distortions. Overall, these findings provide insights into the interplay between size, structure, and magnetism, opening pathways for controlling skyrmionic properties in nanoscale systems.