Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session A54: Skyrmions and Chiral Spin Textures in Thin Films and Multilayers
8:00 AM–10:36 AM,
Monday, March 6, 2023
Room: Room 306
Sponsoring
Unit:
GMAG
Chair: Mi-Young Im, Lawrence Berkeley National Laboratory
Abstract: A54.00006 : Anomalous Hall Effect in Epitaxial Thin Films of the Hexagonal Heusler MnPtGa Noncollinear Hard Magnet*
9:00 AM–9:12 AM
Presenter:
Edouard Lesne
(Max Planck Institute for Chemical Physics of Solids)
Authors:
Edouard Lesne
(Max Planck Institute for Chemical Physics of Solids)
Rebeca Ibarra
(Max Planck Institute for Chemical Physics of Solids)
Bushra Sabir
(University of South Florida, Tampa)
Bachir Ouladiaff
(Institut Laue-Langevin,Grenoble, France)
Ketty Beauvois
(Institut Laue-Langevin, Grenoble, France)
Alexandr S Sukhanov
(Institut für Festkörper- und Materialphysik, Technische Universität Dresden)
Rafal Wawrzynczak
(Max Planck Institute for Chemical Physics of Solids)
Walter Schnelle
(Max Planck Institute for Chemical Physics of Solids)
Anton Devishvili
(Institut Laue-Langevin, Grenoble, France)
Dmytro S Inosov
(2 Institut für Festkörper- und Materialphysik, Technische Universität Dresden)
Jacob Gayles
(University of South Florida, Tampa)
Claudia Felser
(Max Planck Institute for Chemical Physics of Solids)
Anastasios Markou
(Max Planck Institute for Chemical Physics of Solids)
The centrosymmetric MnPtGa films grown by magnetron sputtering on (0001)-Al2O3 crystallize with an out-of-plane c-axis crystal orientation, along which they exhibit preferential perpendicular magnetic anisotropy below their Curie temperature (TC = 263 K). 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 [1].
Furthermore, the anomalous Hall conductivity (AHC) of MnPtGa epitaxial films is found to exhibit a strongly nonmonotonic behaviour as a function of temperature, whereby the AHC changes sign at T* = 110 K; for all investigated films’ thicknesses (20-60 nm). This hints at a common – intrinsic – mechanism governing both the sign of the AHC and the magnitude of the AHE. Our findings, supported by first-principle calculations, strongly suggest an anomalous Hall effect of intrinsic origin, driven by a momentum-space Berry curvature mechanism [2].
[1] R. Ibarra, E. Lesne et al., Appl. Phys. Lett. 120, 172403 (2022). [2] Adv. Mater. Interfaces (accepted).
*This work was supported by the Deutsche Forschungsgemeinschaft (DFG) under SPP 2137 (project no. 403502666) and the European Union’s Horizon 2020 research and innovation programme under FET-Proactive grant agreement no. 824123 – “Skyrmion-Topological Insulator and Weyl Semimetal Technology” (SKYTOP). We acknowledge the support from the DFG via Projects B05 and C03 of the Collaborative Research Center SFB 1143 (Project-id 247310070) at TU Dresden and from the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter – ct.qmat (EXC 2147, Project-id 390858490). J.G acknowledges support from the Max Planck Society through the Max Planck Partner Group Programme. The neutron diffraction experiment at D10 was conducted under proposal #5-54-366.
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