SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 37: Magnetic Heuslers

MA 37.4: Vortrag

Donnerstag, 30. März 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 Ibarra^1,2, 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 (T_C = 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)].