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<p>The domain structure of a MnSb<sub>2</sub>Te<sub>4</sub> single crystal with a Curie temperature of <i>T</i><sub>C</sub> ≈ 45 K has been studied using the high-resolution Bitter decoration technique. Magnetotransport measurements have confirmed soft ferromagnetic ordering with a coercive field of about 100 Oe. The formation of a hierarchical domain structure characterized by two distinct spatial scales has been revealed. These results indicate the existence of weakly magnetically coupled surface and bulk subsystems. The observed subdomain structure can be attributed to the formation of a ferromagnetic barrier due to an inhomogeneous distribution of Mn<sub>Sb</sub> antisite defects with an additional contribution from symmetry breaking in the near-surface layer.</p>

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Subdomain Structure in a Single Crystal of the Magnetic Topological Insulator MnSb2Te4

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月1日

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  • V. A. Tyutvinov,
  • M. S. Sidelnikov,
  • N. A. Abdullayev,
  • Z. S. Aliev,
  • I. R. Amiraslanov,
  • N. T. Mamedov,
  • V. N. Zverev,
  • L. Ya. Vinnikov

摘要

The domain structure of a MnSb2Te4 single crystal with a Curie temperature of TC ≈ 45 K has been studied using the high-resolution Bitter decoration technique. Magnetotransport measurements have confirmed soft ferromagnetic ordering with a coercive field of about 100 Oe. The formation of a hierarchical domain structure characterized by two distinct spatial scales has been revealed. These results indicate the existence of weakly magnetically coupled surface and bulk subsystems. The observed subdomain structure can be attributed to the formation of a ferromagnetic barrier due to an inhomogeneous distribution of MnSb antisite defects with an additional contribution from symmetry breaking in the near-surface layer.