Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 11: Functional Antiferromagnetism

MA 11.14: Talk

Monday, March 18, 2024, 18:30–18:45, EB 202

Mechanisms of current driven Néel vector reorientation in Mn₂Au — •Guzmán Orero Gámez¹, Sonka Reimers¹, Lukas Odenbreit¹, Yuran Niu², Evangelos Golias², Mathias Kläui¹, and Martin Jourdan¹ — ¹Institut für Physik, Johannes Gutenberg-Universität, Staudinger Weg 7, 55128, Mainz, Germany — ²MAX IV Laboratory, Lund, Sweden

Current pulse driven Néel vector reorientation in metallic antiferromagnets (AFM) is one of the most promising concepts in antiferromagnetic spintronics. We have shown that such reorientation can be achieved in the metallic antiferromagnet Mn₂Au through two distinct mechanisms [Rei2023]. The first mechanism is the bulk Neél spin orbit torque, which originates from the unusual crystal structure of Mn₂Au in conjunction with strong spin-orbit coupling. The second mechanism originates from magnetoelastic coupling associated with current driven heating effects. In order to separate these two mechanisms experimentally, we use different geometries to alter the current path, thus changing the strain pattern. Additionally, we modify the pulse duration to reduce the heating. We show that both effects are present with the thermomagnetoelastic being dominant for longer pulse lengths. We use XMLD-PEEM with in-situ current pulsing together with AMR measurements to probe the reorientation of the Néel vector.

[Rei2023] Reimers, S., et al. Current-driven writing process in antiferromagnetic Mn₂Au for memory applications. Nat. Commun. 14, 1861 (2023).

Keywords: Antiferromagnetic spintronics; Mn2Au; Néel Spin Orbit Torque