SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Thin Films: Magnetic Coupling Phenomena / Exchange Bias
MA 5.6: Vortrag
Montag, 27. März 2023, 10:45–11:00, POT 6
In-situ monitoring of the electric-field induced switching process in Fe3O4/Nb:STO heterostructures — •Yifan Xu1, Mai Hussein Hamed1,2, Connie Bednarski-Meinke1, Asmaa Qdemat1, Steffen Tober1, Emmanuel Kentzinger1, Ulrich Rücker1, Oleg Petracic1, and Thomas Brückel1 — 1Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institut (PGI-4), JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany — 2Faculty of Science,Helwan University,11795 Cairo,Egypt
The ability to tune magnetic oxide phases via redox reactions across their heterointerfaces could lead to useful spintronic and memristive device applications. By applying a small electric field, oxidation/reduction occurs at the heterointerface and leads to a reversible phase transition. In this talk, we present the preparation and characterization of epitaxial (001)Fe3O4 thin films grown on TiO2-terminated (001)Nb:STO via pulsed laser deposition. Using magnetometry, we detect the Verwey transition; a strong indicator of the oxygen content in the Fe3O4 films. We observe the disappearance in the Verwey transition temperature with an applied positive electric field. This could be explained by oxygen diffusion through the interface which then leads to a reversible phase transition from Fe3O4(magnetite) to γ-Fe2O3(maghemite). Using ex-situ x-ray diffraction, we observe an additional Fe3O4(111) peak in the out-of-plane direction influenced by the applied voltage. Interestingly, by grazing-incidence small-angle X-ray scattering, we observe a change in the magnetite domain size for the sample after applying the electric field.