Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 11: Functional Antiferromagnetism
MA 11.9: Vortrag
Montag, 18. März 2024, 17:15–17:30, EB 202
Cubic Mn3Ge thin films stabilized through epitaxial growth as a candidate noncollinear antiferromagnet — •James M Taylor1, Anastasios Markou2, Jacob Gayles2, Yan Sun2, Dominik Kriegner2, Walter Schnelle2, Peter Werner1, Claudia Felser2, and Stuart S P Parkin1 — 1Max Planck Institute of Microstructure Physics, Halle — 2Max Planck Institute for Chemical Physics of Solids, Dresden
Metallic antiferromagnets with chiral spin textures induce Berry-curvature-driven anomalous and spin Hall effects that arise from topological bandstructure features. Here we use epitaxial engineering to stabilize thin films of Mn3Ge with a cubic phase. This cubic phase is distinct from tetragonal ferrimagnetic and hexagonal noncollinear antiferromagnetic structures with the same chemical composition. First-principle calculations indicate that cubic Mn3Ge will preferentially form an all-in/all-out triangular spin texture. We present evidence for this noncollinear antiferromagnetism through magnetization and magnetotransport measurements, finding a Néel temperature of 490 K. Simulation of the resulting bandstructure suggests the presence of Berry-curvature-generating features. These highlight cubic Mn3Ge as a candidate material for topological antiferromagnetic spintronics.
Keywords: Noncollinear; Antiferromagnet; Mn3Ge; Thin-film; Topological