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MA: Fachverband Magnetismus
MA 37: Magnetic Heuslers
MA 37.4: Talk
Thursday, March 30, 2023, 10:15–10:30, HSZ 403
Anomalous Hall effect in epitaxial thin films of the hexagonal Heusler MnPtGa noncollinear hard magnet — •Edouard Lesne1, Rebeca Ibarra1,2, Bushra Sabir3, Bachir Ouladdiaf4, Ketty Beauvois4, Alexandr Sukhanov2, Rafal Wawrzynczak1, Walter Schnelle1, Anton Devishvili4, Dmytro Inosov2, Jacob Gayles3, Claudia Felser1, and Anastasios Markou1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Technische Universität Dresden, Dresden, Germany — 3University of South Florida, Tampa, United States of America — 4Institut Laue-Langevin, Grenoble, France
Centrosymmetric MnPtGa Heusler films grown by magnetron sputtering on (0001)−Al2O3 crystallize with an out-of-plane c-axis crystal orientation, along which they exhibit perpendicular magnetic anisotropy below their Curie temperature (TC = 263 K). Further, below a thermally induced spin reorientation transition at 160 K, the magnetic groundtstate, determined by single-crystal neutron diffraction, is found to be a noncollinear spin-canted state where the Mn moments tilt 20∘ away from the c-axis [Appl. Phys. Lett. 120, 172403 (2022)].
Furthermore, the anomalous Hall conductivity (AHC) of 20−60 nm thick MnPtGa epitaxial films is found to exhibit a strongly nonmonotonic behaviour as a function of longitudinal conductivity and temperature, whereby the AHC changes sign at T* = 110 K. Our findings, supported by first-principle calculations, hint at an anomalous Hall effect of intrinsic origin driven by a momentum-space Berry curvature mechanism [Adv. Mater. Interfaces 9, 2201562 (2022)].