Sub-domain structure in a single crystal of the magnetic topological insulator MnSb2Te4

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

arXiv · 2601.12399

Sub-domain structure in a single crystal of the magnetic topological insulator MnSb2Te4

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

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Abstract

The domain structure of a MnSb$_2$Te$_4$ single crystal with a Curie temperature $T_C \approx 45~K$ was studied using the high-resolution Bitter decoration technique. Magnetotransport measurements confirm a soft ferromagnetic ordering with a coercive field of $ \sim 100$ Oe. We revealed the formation of a hierarchical domain structure characterized by two distinct spatial scales. These results indicate the existence of two magnetically weakly coupled subsystems -- surface and bulk. The observed sub-domain structure can be attributed to the formation of a ferromagnetic well due to an inhomogeneous distribution of $\mathrm{Mn_{Sb}}$ antisite defects, with an additional contribution from symmetry breaking in the near-surface layer.

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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. 2026-01-18. Sub-domain structure in a single crystal of the magnetic topological insulator MnSb2Te4. https://arxiv.org/abs/2601.12399

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