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000911258 1001_ $$0P:(DE-Juel1)186907$$aXu, Yifan$$b0$$ufzj
000911258 1112_ $$aInternational workshop GISAXS2022$$cDESY, Hamburg$$d2022-11-16 - 2022-11-18$$wGermany
000911258 245__ $$aInvestigation of the oxygen vacanciy diffusion via applied electric field in oxide heterostructures
000911258 260__ $$c2022
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000911258 520__ $$aThe ability to tune magnetic oxide phases via redox reactions across their heterointerfacescould lead to useful spintronic and memristive device applications. By applyinga small electric field, oxidation/reduction occurs at the heterointerface and leads to areversible phase transition [1-2]. In this poster, we present the preparation and characterizationof epitaxial Fe3O4 thin films grown on TiO2 - terminated Nb:STO via pulsedlaser deposition (PLD). Using magnetometry, we detect the Verwey transition; a strongindicator of the oxygen content in the Fe3O4 films. We observe a significant decreasein the Verwey transition temperature with applied positive electric field. This could bebe explained by oxygen diffusion through the interface which then leads to a reversiblephase transition from Fe3O4(magnetite) to γ-Fe2O3(maghemite). The oxygen diffusionalso induces a structural change of the crystal lattice. Using x-ray diffraction (XRD),we can investigate the strain and structural transitions in the out-of-plane direction.Interestingly, by GISAXS we observe a decrease of the magnetite domain size for thesample after applying the electric field. We surmise this arises due to oxygen diffusionbetween interfaces. PNR measurements are being planned to confirm this.
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000911258 7001_ $$0P:(DE-Juel1)169789$$aHussein, Mai$$b1$$ufzj
000911258 7001_ $$0P:(DE-Juel1)184662$$aBednarski-Meinke, Connie$$b2$$ufzj
000911258 7001_ $$0P:(DE-Juel1)187095$$aQdemat, Asmaa$$b3$$ufzj
000911258 7001_ $$0P:(DE-Juel1)191430$$aTober, Steffen$$b4$$ufzj
000911258 7001_ $$0P:(DE-Juel1)130754$$aKentzinger, Emmanuel$$b5$$ufzj
000911258 7001_ $$0P:(DE-Juel1)145895$$aPetracic, Oleg$$b6$$ufzj
000911258 7001_ $$0P:(DE-Juel1)130572$$aBrückel, Thomas$$b7$$ufzj
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