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MA: Fachverband Magnetismus
MA 43: Skyrmions III / Non-Skyrmionic Magnetic Textures II
MA 43.13: Vortrag
Freitag, 21. März 2025, 12:45–13:00, H16
Fascinating mesoscale magnetic textures in the topological Kagome system TbMn6Sn6 — •Ralph Rajamathi1, Manuel Zahn1,2, Kai Litzius1, István Kézsmárki1, and Sándor Bordács3 — 1Center for Electronic Correlations and Magnetism, University of Augsburg — 2Department of Materials Science and Engineering, Norwegian University of Science and Technology — 3Department of Physics, Budapest University of Technology and Economics
In recent years, the Kagome ferrimagnet TbMn6Sn6 has garnered significant interest due to its unconventional band topology, which realizes exotic quantum states like a Chern insulating phase. It exhibits a spin-reorientation transition (SRT) from easy-axis to easy-plane at 310 K, where skyrmion bubbles have been observed in lamellae. However, magnetic textures in bulk crystals have been unexplored so far. Here, we used magnetic force microscopy (MFM) to image the magnetic pattern on the surface of bulk crystals, and magnetometry to study the role of second order magnetic anisotropy. Two types of textures were observed, namely long-ranged stripes that invert contrast on reversing the tip’s magnetization, decorated by star-shaped structures whose contrast is independent from the the tip’s magnetization. Reorientation of the stripes and creation/elimination of the "stars" in an external magnetic field indicate low magnetic pinning. Analyzing the in-plane magnetometry data, a metastable magnetization state was observed below the SRT temperature, indicating the possibility of an intermediate in-plane state, which was observed by MFM in the vicinity of SRT.