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MA: Fachverband Magnetismus

MA 43: Skyrmions III / Non-Skyrmionic Magnetic Textures II

MA 43.14: Vortrag

Freitag, 21. März 2025, 13:00–13:15, H16

Domain walls with 90^∘ magnetization rotation in the topological kagome magnet TbMn₆Sn₆ — •Manuel Zahn^1,2, Ralph Rajamathi¹, Kai Litzius¹, Dennis Meier², Sándor Bordács³, and István Kézsmárki¹ — ¹Center for Electronic Correlations and Magnetism, University of Augsburg — ²Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU) — ³Department of Physics, Budapest University of Technology and Economics

The layered Kagome ferrimagnet, TbMn₆Sn₆, attracts much attention due to its topologically non-trivial features. The bulk electronic band structure realizes a Chern insulating state and in the real space, skyrmion bubbles have been observed in thin lamellae of this compound. TbMn₆Sn₆ exhibits a zero-field first-order spin reorientation transition at T_SR = 315 K, below/above which the magnetic moment points perpendicular/parallel to the Kagome plane. Here, using magnetic force microscopy, we reveal peculiar domain textures in the vicinity of T_SR on the surface of bulk TbMn₆Sn₆ crystals. Upon approaching T_SR from lower temperatures, we observed a broadening of the domain walls separating regions oppositely magnetized perpendicular to the Kagome plane, and the emergence of a strictly in-plane magnetized region at the center of the walls. We compared these results with analytical calculations based on a continuum magnetic model and found that the π/2 stepwise rotation of the magnetization is a universal effect at the spin reorientation transition.

Keywords: magnetic force microscopy; magnetic anisotropy; Kagome magnet