Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 98: Electronic structure: Surface magnetism and spin phenomena I
O 98.10: Vortrag
Donnerstag, 15. März 2018, 17:30–17:45, MA 042
Spin-orbit gaps in ferromagnetic thin films — •Lukasz Plucinski1, Ewa Mlynczak1, Stephan Borek2, Jan Minar2, Jürgen Braun2, Mathias Gehlmann1, Irene Aguilera3, Gustav Bihlmayer3, Stefan Blügel3, Hubert Ebert2, and Claus M. Schneider1 — 1PGI-6, FZ Jülich — 2LMU, Munich — 3PGI-1, FZ Jülich
Magnetization direction can control topological phases in ferromagnets by influencing the existence of nodal points and spin-orbit gaps, which control intrinsic magnetotransport properties. Using high resolution angle-resolved photoemission we demonstrate openings of spin-orbit gaps, near the Fermi level [PRX 6, 041048 (2016)]. The gaps and thus the Fermi surface could be manipulated by changing the remanent magnetization direction, and we find qualitative agreement to the one-step model photoemission calculations. For thinner films the quantum confinement leads to quantum wells which also exhibit anisotropy. The analysis of spin-polarized photoemission from these quantum wells allows the unambiguous identification of the initial bands, which has been often challenging due to correlation effects in the band structure, which are beyond the description of popular exchange-correlation potentials. Good agreement is found by comparison to the bulk band structure calculated using the GW method under the assumption of perpendicular momentum broadening due to the finite probing depth of photoemission. This study contributes to better understanding of the role of Berry phase physics in anomalous Hall conductivity and related phenomena in 2D ferromagnetic layers.