% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@INPROCEEDINGS{Xu:907218,
      author       = {Xu, Yifan},
      title        = {{T}uning the magnetic and structural properties of
                      {F}e3{O}4 films grown on {N}b:{S}r{T}i{O}3 substrates},
      reportid     = {FZJ-2022-01899},
      year         = {2022},
      abstract     = {Tuning magnetic oxide phases via redox reactions across
                      their heterointerfaces makesthem useful for spintronic and
                      memristive device applications. In Mai Hussein
                      Hamed’sprevious study, an interesting insight of tuning
                      the Fe3O4 thin films on SrTiO3 substratesinterface via
                      annealing was given [1]. Inspired by memristor, I further
                      studied totun it by applying electric field. Using
                      controlled film-substrate interfaces and a smallelectric
                      field, it is possible that an oxidation/reduction reaction
                      occurs which leads toa reversible phase transition in the
                      thin film.The quality of Fe3O4 thin films is sensitive to
                      the growth parameters. In my talk, Iwill first introduce the
                      growth optimization of Fe3O4 thin films on Nb-STO using
                      PLD.The characterization of Fe3O4 thin films structural and
                      magnetic qualities is introducedin detail. Furthermore,
                      using magnetometry, we can detect the Verwey transition
                      whichis a strong indicator of the oxygen content in the
                      Fe3O4 films. I will present the observationof a strong
                      change in the Verwey transition with an applied electric
                      field. Thiscan be explained by oxygen diffusion through the
                      interface which leads to a reversiblephase transition from
                      Fe3O4(magnetite) to γ-Fe2O3(maghemite). Additionally, we
                      investigatethe structural transitions using ex-situ XRD. In
                      the outlook, I will furtherpropose the possible in-situ
                      measurement while applying voltage in order to study
                      theoxygen stoichiometry, as well as the possible tuning by
                      annealing.},
      organization  = {(Digital) Institute Seminar JCNS-2
                       (Master Colloquium Talk), (Germany +
                       online event)},
      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)31},
      url          = {https://juser.fz-juelich.de/record/907218},
}