TY  - CONF
AU  - Xu, Yifan
AU  - Hussein, Mai
AU  - Bednarski-Meinke, Connie
AU  - Qdemat, Asmaa
AU  - Tober, Steffen
AU  - Kentzinger, Emmanuel
AU  - Petracic, Oleg
AU  - Brückel, Thomas
TI  - Investigation of the oxygen vacanciy diffusion via applied electric field in oxide heterostructures
M1  - FZJ-2022-04554
PY  - 2022
AB  - The ability to tune magnetic oxide phases via redox reactions across their heterointerfacescould lead to useful spintronic and memristive device applications. By applyinga small electric field, oxidation/reduction occurs at the heterointerface and leads to areversible phase transition [1-2]. In this poster, we present the preparation and characterizationof epitaxial Fe3O4 thin films grown on TiO2 - terminated Nb:STO via pulsedlaser deposition (PLD). Using magnetometry, we detect the Verwey transition; a strongindicator of the oxygen content in the Fe3O4 films. We observe a significant decreasein the Verwey transition temperature with applied positive electric field. This could bebe explained by oxygen diffusion through the interface which then leads to a reversiblephase transition from Fe3O4(magnetite) to γ-Fe2O3(maghemite). The oxygen diffusionalso induces a structural change of the crystal lattice. Using x-ray diffraction (XRD),we can investigate the strain and structural transitions in the out-of-plane direction.Interestingly, by GISAXS we observe a decrease of the magnetite domain size for thesample after applying the electric field. We surmise this arises due to oxygen diffusionbetween interfaces. PNR measurements are being planned to confirm this.
T2  - International workshop GISAXS2022
CY  - 16 Nov 2022 - 18 Nov 2022, DESY, Hamburg (Germany)
Y2  - 16 Nov 2022 - 18 Nov 2022
M2  - DESY, Hamburg, Germany
LB  - PUB:(DE-HGF)24
UR  - https://juser.fz-juelich.de/record/911258
ER  -