Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 54: Spin-dependent transport phenomena

MA 54.6: Vortrag

Freitag, 16. März 2018, 09:15–09:30, EB 301

Topological and anomalous Hall and Nernst effect in Mn₃X (X = Ge and Sn ) — •Ilias Samathrakis¹, Jürgen Weischenberg², and Hongbin Zhang¹ — ¹Institute of Materials Science, TU Darmstadt, 64287 Darmstadt, Germany — ²Department of Physics, RWTH Aachen University, 52074 Aachen, Germany

Antiferromagnets have recently become a hot research topic for spintronic applications. Unlike ferromagnets, they are robust against perturbations due to magnetic fields. Consequently, non-collinear magnets have also attracted some interest, being part of the antiferromagnetic spintronics. An interesting series of non-collinear antiferromagnets that has been extensively studied is Mn₃X (X=Ge and Sn ). The combination of magnetic frustration and the relatively small energy difference among possible magnetic configurations make them ideal candidates. Till now, a consistent theory for the angular dependence of the anomalous hall conductivity and its physical origin is still missing. In this work, we performed calculations on both the intrinsic and the side-jump contributions, with (anomalous), as well as without (topological) spin-orbit coupling. It is observed that the angular dependence of the anomalous Hall conductivity is unusual. Detailed comparison between Mn₃Ge and Mn₃Sn is shown focusing on the magnitude of their anomalous Hall and anomalous Nernst effects, where significant side jump contribution due to impurities.