Berlin 2024 – scientific programme
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DS: Fachverband Dünne Schichten
DS 20: Poster II
DS 20.15: Poster
Thursday, March 21, 2024, 18:00–20:30, Poster D
Tuning the magnetic properties of Fe3O4 thin films driven by electric field — •Yifan Xu1,2, Patrick Schoeffmann3, Connie Bednarski-Meinke2, Chenyang Yin1,2, Steffen Tober2, Asmaa Qdemat2, Oleg Petracic2,1, and Mai Hussein Hamed2,4 — 1Heinrich Heine University Düsseldorf, Faculty of Mathematics and Natural Sciences, Düsseldorf, Germany — 2Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institut (PGI-4), JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, Germany — 3Synchrotron SOLEIL, Saint-Aubin, France — 4Faculty of Science, Helwan University, Cairo, Egypt
Tuning magnetic oxide phases at heterointerfaces is a compelling strategy for advancing spintronic and memristive device applications. Specifically for iron oxides, we have shown that we can tune the magnetic and electrical properties of thin films upon initiating a phase transition between magnetite, maghemite and wüstite. Here we show the preparation and characterization of epitaxial Fe3O4 thin films grown on TiO2 - terminated Nb:SrTiO3 substrates via pulsed laser deposition (PLD). We observe a change in the Verwey transition - a critical indicator of the oxygen content in the Fe3O4 films and in particular, the disappearance of the Verwey transition when positive electric field is applied. In addition, using X-ray Magnetic Circular Dichroism (XMCD), we observed a shift in the Fe Edge. This could be explained by oxygen diffusion through the interface leading to a reversible phase transition from Fe3O4(magnetite) to γ-Fe2O3(maghemite).
Keywords: Iron oxide; XMCD; PLD; PNR; STO