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MA: Fachverband Magnetismus

MA 3: Ultrafast Magnetization Effects I

MA 3.6: Vortrag

Montag, 18. März 2024, 11:15–11:30, H 2013

Ultrafast Spin Dynamics in non-collinear Antiferromagnetic Mn₃Sn — •Chongxiao Fan^1,2, Bingke Xiang³, Dante Kennes^2,1, Angel Rubio^1,4, Yihua Wang³, and Peizhe Tang^5,1 — ¹Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany. — ²Institut für Theorie der Statistischen Physik, RWTH Aachen University, 52062 Aachen, Germany. — ³State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China — ⁴Center for Computational Quantum Physics (CCQ), The Flatiron Institute, 162 Fifth avenue, New York NY 10010, USA. — ⁵School of Materials Science and Engineering, Beihang University, Beijing 100191, China

Ultrafast manipulation of magnetic moments is a captivating subject within contemporary magnetism and spintronics. In this work, we conduct a pump-probe experiment on the non-collinear antiferromagnet Mn₃Sn, which shows large anomalous Hall effect due to nontrivial topology of its electron band structure. The observed asynchronous alteration after the pump in both the magneto-optical Kerr signal and reflectivity implies changes linked not only to the electron occupation but also to a change of the spin configuration. The relatively low heat capacity of electrons will cause a rapid increase in electron temperature and thermoelectric current can generate polarized current. Spin dynamics calculation confirmed the possible formation of a net magnetization when the pump fluence is large. Our research uncovers novel phenomena within antiferromagnets, offering a fresh approach to comprehend ultrafast physics in magnetic systems.

Keywords: ultrafast dynamics; anomalous Hall effect; spin dynamics