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MA: Fachverband Magnetismus

MA 21: Phd Focus Session: Altermagnets: Foundations and Experimental Evidence

MA 21.3: Talk

Wednesday, March 20, 2024, 10:30–10:45, H 1058

Magneto-transport and magnetometry measurements in altermagnetic RuO2 — •Ruben Dario Gonzalez Betancourt1,4, Teresa Tschirner1,2, Philipp Kessler2,3, Tommy Kotte5, Dominik Kriegner4,6, Bernd Büchner1,2,6, Joseph Dufouleur1, Libor Šmejkal4,7, Jairo Sinova4,7, Ralph Claessen2,3, Tomas Jungwirth4,8, Simon Moser2,3, Helena Reichlová4,6, and Louis Veyrat1,2,31IFW Dresden — 2Würzburg-Dresden Cluster of Excellence ct.qmat, Germany — 3Physikalisches Institut, Universität Würzburg, Germany — 4Institute of Physics, AV ČR, Prague — 5HLD-EMFL, Helmholtz-Zentrum Dresden-Rossendorf — 6IFMP, TU Dresden — 7JGU, Mainz — 8University of Nottingham

Altermagnets are a newly identified class of magnetic materials [1] that exhibit alternating spin polarization in both their real and reciprocal space. This intriguing feature allows altermagnetic materials to demonstrate important spintronic effects, such as the anomalous Hall effect (AHE), previously believed to be absent in collinear compensated systems. RuO2 has emerged as an altermagnetic model material, and in this presentation, I will summarize the experimental evidence of the AHE in this material [2,3]. Additionally, I will focus on detailed magnetometry measurements on RuO2 thin films grown on TiO2 substrates with various orientations and compare the results with transport measurements.

[1] L. Šmejkal et al., Phys. Rev. X. 12.031042 (2022) [2] Feng, Z., et al. Nat. Electron. 5, 735*743 (2022) [3] T. Tschirner et al., APL Mater. 11, 101103 (2023)

Keywords: Altermagnets; RuO2; Anomalous Hall effect

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