Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.54: Poster
Donnerstag, 15. März 2018, 15:00–18:00, Poster C
Magnetoelectronic structure of ultrathin Fe3O4/SrTiO3 heterointerfaces — •Mai Hussein Hamed1, Ronja Anika Heinen1, Marek Wilhem1, Patrick Lömker1, Carolin Schmitz-Antoniak1, Andrei Gloskovsky2, Wolfgang Drube2, Claus M. Schneider1,3, and Martina Müller1,4 — 1Peter-Grünberg-Institut (PGI-6), Forschungszentrum Jülich GmbH, Germany. — 2Photon Science, DESY, Hamburg, Germany. — 3Fakultät für Physik, Universität Duisburg-Essen, Germany. — 4Experimentelle Physik I, Technische Universität Dortmund, Germany.
Fe3O4/SrTiO3 heterostructures are promising candidates for oxide spintronics, as their functionality depends strongly on the interface properties. For this purpose, we emphasized on the impact of reduces dimensionality on the magnetoelectronic and structural properties of ultrathin magnetite.
Magnetite thin films are grown epitaxially on Nb-SrTiO3(001) substrates via pulsed laser deposition with varying thicknesses (d=2-38nm). By magnetic characterization, it is found for ultrathin Fe3O4 coverages (d=2nm) that the saturation magnetization MS reduces to 1µB/f.u and the Verwey transition shifts towards lower value TV=20K instead of 4µB/f.u and 120K for bulk Fe3O4 respectively. Using HAXPES and XMCD techniques provides complementary element-selective information of the surface and buried interface magnetoelectronic structure. Our results suggest the formation of a 2ML γ-Fe2O3 intralayer at the interfaces. Interfacial redox reaction or oxygen mobility could account for the formation of this intralayer phase.