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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 Betancourt^1,4, Teresa Tschirner^1,2, Philipp Kessler^2,3, Tommy Kotte⁵, Dominik Kriegner^4,6, Bernd Büchner^1,2,6, Joseph Dufouleur¹, Libor Šmejkal^4,7, Jairo Sinova^4,7, Ralph Claessen^2,3, Tomas Jungwirth^4,8, Simon Moser^2,3, Helena Reichlová^4,6, and Louis Veyrat^1,2,3 — ¹IFW 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