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Spin structure of spin-orbit split surface states in a magnetic material revealed by spin-integrated photoemission

AuthorsUsachov, Dmitry Yu.; Güttler, Monika; Schulz, Susanne; Poelchen, Georg; Seiro, Silvia; Kliemt, Kristin; Kummer, Kurt; Krellner, Cornelius; Laubschat, Clemens; Chulkov, Eugene V. ; Vyalikh, Denis V.
Issue Date2020
PublisherAmerican Physical Society
CitationPhysical Review B 101(24): 245140 (2020)
AbstractThe emergence of ferromagnetism in Rashba systems, where the evolving exchange interaction enters into competition with spin-orbit coupling, leads to a nontrivial spin-polarized electronic landscape with an intricate momentum-dependent spin structure, which is challenging to unveil. Here, we show a way to disentangle the contributions from the effective spin-orbit and exchange fields and thus to gain knowledge of the spin structure in ferromagnetic Rashba materials, which is required for spintronic applications. Our approach is based exclusively on spin-integrated photoemission measurements combined with a two-band modeling. As an example, we consider the mixed-valent material EuIr2Si2 which, while being nonmagnetic in the bulk, reveals strong ferromagnetism at the iridium-silicide surface where both spin-orbit and exchange magnetic interactions coexist. The combined effect of these interactions causes a complex band dispersion of the surface state which can be observed in photoemission experiments. Our method allows us to comprehensively unravel the surface-state spin structure driven by spin-orbit coupling at the ferromagnetic surface. This approach opens up opportunities to characterize the spin structure of ferromagnetic Rashba materials, especially where dedicated spin-resolved measurements remain challenging.
Publisher version (URL)https://doi.org/10.1103/PhysRevB.101.245140
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