2024/07/26 by Sinéad A. Ryan, Ryan, Sinéad A., Anya Grafov +19 · 1 citation
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Magnetic Properties of Alloys #Materials Science (cond-mat.mtrl-sci) #Rare-earth and actinide compounds
paper · pdf · doi:10.48550/arxiv.2407.18894
openalex publication_date 2024/07/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Kagome ferrimagnets are of fundamental interest because of their tunable magnetic, electronic and topological properties, with potential applications for quantum-enabled technologies and spintronics. Here we present the first direct measurement of the intrinsic timescale of the spin reorientation transition in the Kagome ferrimagnet TbMn6Sn6. This material exhibits a magnetic phase transition near room temperature, where spins remain collinear while the total magnetic moment rotates from out-of-plane to in-plane. This reorientation has been attributed to the competing anisotropies of Tb and Mn, whose magnetic moments have very different temperature dependencies. By probing at the Mn M-edge using high harmonic extreme ultraviolet pulses, we measure reorientation timescales between 6 and 18 ps, depending on the laser excitation fluence. Our model of the magnetization dynamics shows that this timescale is consistent with a spin reorientation driven by very large anisotropy energies, on meV energy scales. Our model also predicts a possibility of a 180∘ reorientation of the out-of-plane moment, that could facilitate optically controlled magnetization switching between very stable ground states, for applications in spintronics or data storage.