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@INPROCEEDINGS{Xu:911258,
      author       = {Xu, Yifan and Hussein, Mai and Bednarski-Meinke, Connie and
                      Qdemat, Asmaa and Tober, Steffen and Kentzinger, Emmanuel
                      and Petracic, Oleg and Brückel, Thomas},
      title        = {{I}nvestigation of the oxygen vacanciy diffusion via
                      applied electric field in oxide heterostructures},
      reportid     = {FZJ-2022-04554},
      year         = {2022},
      abstract     = {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.},
      month         = {Nov},
      date          = {2022-11-16},
      organization  = {International workshop GISAXS2022,
                       DESY, Hamburg (Germany), 16 Nov 2022 -
                       18 Nov 2022},
      subtyp        = {Invited},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/911258},
}