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MA: Fachverband Magnetismus
MA 59: Posters Magnetism III
MA 59.13: Poster
Freitag, 20. März 2020, 09:00–12:00, P2/EG
Topological Magnetic Textures in Antiskyrmion Hosting Heusler Compounds MnxYZ — •Jacob Gayles, Yan Sun, and Claudia Felser — Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden
Recently, the Heusler compounds Mn1.4PtSn and Mn1.4Pt0.9Pd0.1Sn were shown to stabilize an antiskyrmion lattice above room temperature and without an external magnetic field. These Heusler compound forms in a superstructure with the D2d symmetry, which allows for an anisotropic Dzyaloshinskii-Moriya interaction (DMI) perpendicular to the tetragonal axis. Furthermore, many of these compounds show a spin reorientation transition where the topological Hall effect is much larger below the transition than above in the known antiskyrmion regime. We perform density functional theory calculations of MnxYZ compounds to extract the relevant exchange interactions that determine the rich phase diagrams in these materials. The exchange interactions are between the large moments on the Mn atoms ∼4µB, which show magnetic states that are non-collinear ferrimagnetic up to the spin reorientation. The major role of the spin-orbit driven DMI is due to the Z ion, either In, Ga, Sn or Sb where the Y ion (Ru, Rh, Pd, Ir, or Pt ) d-states lowered in energy due to the Jahn-Teller distortion. The content of Mn also plays a large role in the stabilization of the magnetic textures. The electron occupation can be tuned by the Y ion, either In, Sn or Sb. We last calculate the anomalous Hall effect and topological Hall effects in these regimes, to capture the influence of the electronic structure on the Berry curvature.