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MA: Fachverband Magnetismus
MA 24: Magnetic Heusler Compounds
MA 24.4: Vortrag
Dienstag, 17. März 2020, 10:15–10:30, HSZ 403
Anomalous Hall effect and spin orbit torques in tetragonal ferrimagnetic Mn3−xPtxGa thin films — •Dominik Kriegner1,2,3, Anastasios Markou1, Helena Reichlova2, Richard Schlitz2, Claudia Felser1, and Sebastian T.B. Goennenwein2 — 1Max Planck Institute for Chemical Physics of Solids, Dresden — 2Institut für Festkörper- und Materialphysik, TU Dresden and Würzburg-Dresden Cluster of Excellence ct.qmat — 3Institute of Physics, Academy of Science of the Czech Republic
We systematically study the variation of magnetization and anomalous Hall effect in Mn3−xPtxGa thin films as function of the Pt content and temperature. Since Mn and Pt share a lattice site and Mn occupies two distinct sites with ferrimagnetic arrangement of the magnetic moments, the system can be driven to a magnetic compensation point [1]. At this point Mn3−xPtxGa can behave similar to the well known antiferromagnetic half Heusler CuMnAs with which is shares its symmetry. CuMnAs was recently found to have a switchable antiferromagnetic order by a charge current induced staggered Neel spin orbit torque [2]. We propose to use Mn3−xPtxGa near the compensation point as a model system to study this spin orbit torque. Here the non-zero magnetization can be used to orient the ferrimagnetic order by moderate magnetic field to prepare the system in a defined state. The current induced torque, (i.e. the variation of the magnetization,) is obtained by homodyne detection and its effect is mapped out for various magnetization orientations. [1] R. Sahoo et al., Adv. Mater. 28, 8499 (2016) [2] P. Wadley et al., Science 351, 587 (2016)