Poster (Invited)

FZJ-2024-03298

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tuning the magnetic properties of Fe3O4 thin films driven by electric field

Xu, Y. ; Schöffmann, P. ; Bednarski-Meinke, C.FZJ* ; Yin, C.FZJ* ; Tober, S.FZJ* ; Qdemat, A.FZJ* ; Petracic, O.FZJ* ; Hussein, M.FZJ*

2024

Abstract: Tuning magnetic oxide phases at heterointerfaces is a compelling strategy foradvancing spintronic and memristive device applications. Specifically for ironoxides, we have shown that we can tune themagnetic and electrical properties ofthin films upon initiating a phase transition between magnetite, maghemite andwustite. Here we show the preparation and characterization of epitaxial Fe3O4thin films grown on TiO2 - terminated Nb:SrTiO3 substrates via pulsed laser deposition(PLD).We observe a change in the Verwey transition - a critical indicatorof the oxygen content in the Fe3O4 films and in particular, the disappearanceof the Verwey transition when positive electric field is applied. In addition, usingX-ray Magnetic Circular Dichroism (XMCD), we observed a shift in the FeEdge. This could be explained by oxygen diffusion through the interface leadingto a reversible phase transition fromFe3O4(magnetite) to γ-Fe2O3(maghemite).

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Contributing Institute(s):

1. Streumethoden (JCNS-2)
2. Streumethoden (PGI-4)
3. JARA-FIT (JARA-FIT)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)

Appears in the scientific report 2024

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