SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 32: Semiconductor Substrates
O 32.4: Vortrag
Dienstag, 28. März 2023, 11:15–11:30, GER 39
Electronic and magnetic properties of ultrathin FeBr2 films grown on Bi/Si(111) — •Shigemi Terakawa1, Jiabao Yang1, Shinichiro Hatta2, Hiroshi Okuyama2, Tetsuya Aruga2, Niels Schröter1, and Stuart Parkin1 — 1Max Planck Institute of Microstructure Physics, Halle, Germany — 2Graduate School of Science, Kyoto University, Kyoto, Japan
Mono and a few layers of van der Waals (vdW) magnets are promising two-dimensional (2D) materials to fabricate heterostructures with topological materials to realize novel topological phases via proximity effects, such as the quantum anomalous Hall effect. FeBr2 is a layered Ising antiferromagnet, where the magnetic moments are coupled ferromagnetically in a layer and antiferromagnetically between adjacent layers. We succeeded in the epitaxial growth of ultrathin FeBr2 films using molecular-beam epitaxy on Bi/Si(111) substrate. We observed insulating band structures using angle-resolved photoelectron spectroscopy (ARPES). The valence band top is located at a flat band with a binding energy of 2 eV, which is ascribed to Fe 3d orbitals. At monolayer coverage, the Fe 3d flat band does not change but dispersive bands of Br 4p at 7-8 eV are largely altered due to the disappearance of inter-layer Br-Br coupling in the monolayer film. The monolayer film shows a strong moire pattern in low-energy electron diffraction (LEED), suggesting a strong coupling between the FeBr2 and Bi films. We plan to discuss the magnetic properties of the FeBr2 films from the results of XMCD experiments.