Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 22: Thin Films: Coupling Effects and Exchange Bias
MA 22.5: Vortrag
Mittwoch, 20. März 2024, 11:00–11:15, H 2013
Enhanced magnetism at 3d FM/EuO interfaces: Insights from core level photoelecton spectroscopy — •Paul Rosenberger1,2, Moumita Kundu1, Andrei Gloskovskii3, Christoph Schlüter3, Ulrich Nowak1, and Martina Müller1 — 1FB Physik, Universität Konstanz, Germany — 2Fakultät Physik, TU Dortmund, Germany — 3DESY, Hamburg, Germany
The semiconducting Heisenberg ferromagnet EuO (µ = 7 µB/f.u.) is a template for studying novel spin-related phenomena, but suffers from a rather low TC (69 K) [1]. A magnetic proximity effect (MPE) in EuO interfaced with Fe or Co results in a TC enhancement, but its microscopic origin and depth-dependence are not yet understood.
Here, the depth-dependent magnetic order at Fe/EuO and Co/EuO interfaces was studied by emission-angle dependent magnetic circular dichroism (MCD) in hard-X-ray photoelectron spectroscopy (HAXPES). Bilayers with EuO film with thicknesses of 4 nm and 11 nm were measured at T=40 K<TC and T=80 K>TC. The results confirm antiferromagnetic coupling between the 3d FM overlayers and EuO. At T>TC, magnetic order in thin EuO is observed. The degree of magnetic order was found to decrease with increasing distance from the interface. Initially magnetized in-plane EuO has a non-zero magnetic out-of-plane component at T>TC. The experiments are complemented by atomistic spin simulations.
[1] P. Rosenberger and M. Müller, PRM 6, 044404 (2022).
Keywords: EuO; buried interface; proximity effect; HAXPES; XMCD