Workshop 2025: Fascinating mesoscale magnetic textures in the topological Kagome system TbMn6Sn6

Session Information

Location: Lecture room F3213 - 20
Day: Wednesday, 14 May
Time: 18:00 - 19:00
Chairperson: -

Presentation Details

Presentation Type: Poster presentation (Training School only)
Title: Fascinating mesoscale magnetic textures in the topological Kagome system TbMn6Sn6
Abstract: 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 [1]. It exhibits a spin-reorientation transition (SRT) from easy-axis to easy-plane above 310K, where skyrmion bubbles have been observed in lamellae [2]. Less, however, is known about the bulk magnetic textures in this system. Here, we used magnetic force microscopy (MFM) to image the magnetic structure of TbMn6Sn6, 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, and smaller star-shaped struc- tures that do not invert, possibly indicating two different magnetization mechanisms. The effect of an external magnetic field was also studied, showing that the textures were indeed affected by the same. Analyzing the in-plane magnetometry data, a metastable magnetization state was observed for curves below the SRT temperature, indicating the possibility of an intermediate canted state. This was confirmed via temperature-dependent MFM, where three distinct con- trasts were observed.

[1] J. Yin, W. Ma, Nature 583, 533-536 2023.
[2] Z. Li, Q. Yin, Adv. Mater. 35, 2211164 2020.

Presenter

Mr Ralph Rajamathi
University of Augsburg | Germany

Authors

1. Ralph Rajamathi | Center for Electronic Correlations and Magnetism, University of Augsburg
2. Manuel Zahn | Center for Electronic Correlations and Magnetism, University of Augsburg | Department of Materials Science and Engineering, Norwegian University of Science and Technology
3. Kai Litzius | Center for Electronic Correlations and Magnetism, University of Augsburg
4. Istvan Kezsmarki | Center for Electronic Correlations and Magnetism, University of Augsburg
5. Sandor Bordacs | Department of Physics, Budapest University of Technology and Economics