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@PHDTHESIS{Gonzalez:851779,
      author       = {Gonzalez, Sara},
      title        = {{O}perando {C}hemistry and {E}lectronic {S}tructure of
                      {E}lectrode / {F}erroelectric {I}nterfaces},
      volume       = {175},
      school       = {Cotutelle, Universität Duisburg und Université
                      Paris-Orsay,},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2018-05294},
      isbn         = {978-3-95806-341-9},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Schlüsseltechnologien / Key Technologies},
      pages        = {172 S.},
      year         = {2018},
      note         = {Cotutelle, Universität Duisburg und Université
                      Paris-Orsay, Diss., 2016},
      abstract     = {In the past decade, oxide-based heterostructures have been
                      studied extensively as potentially attractive systems for
                      applications in nanoelectronics. Among them, ferroelectric
                      materials raised interest as potential support for those
                      technological applications. Indeed, their spontaneous
                      electric polarization easily switched by applying an
                      electric field makes them a good basis for non-volatile data
                      storage. Switching the polarization requires a metallic
                      contact with an electrode, thus heterostructures of
                      ferroelectric thin films with metallic electrodes have been
                      widely studied. At the interface between those two
                      materials, free charges of the electrode help screening the
                      polarization induced surface charges detrimental to
                      maintaining proper polarization in the ferroelectric thin
                      film. With metallic oxide electrodes, an ionic displacement
                      at the electrode/ferroelectric interface will help the
                      screening, bringing this interface at the core of the
                      screening process. However, despite important theoretical
                      discoveries, direct experimental data is scarce and the
                      behavior of the electrode/ferroelectric interface is still
                      only partially understood. Further understanding is crucial
                      for a proper integration of ferroelectric films in
                      functioning nanometer-sized devices. In this thesis,
                      photoemission spectroscopy based techniques are used to
                      probe the buried interface of an
                      electrode/BaTiO$_{3}$/electrode heterostructure, for two
                      different top electrodes: the metallic oxide SrRuO$_{3}$ and
                      the Co metal. Combining operando hard X-ray photoemission
                      spectroscopy, hard X-ray photoemission electron microscopy
                      and time-resolved experiments, we acquired information on
                      the behavior of the interface and its response to
                      polarization switching. The work presented is a new step
                      towards a complete understanding on the behavior of the
                      interface between electrodes and ferroelectric materials, in
                      the case of electrode / BaTiO$_{3}$ / electrode
                      heterostructures, in terms of electronic properties,
                      kinetic, and fatigue. The three experiments presented
                      combined state of the art characterization techniques, where
                      the use of hard X-rays and in situ bias application made it
                      possible to resolve the difficult task of probing buried
                      interfaces in working conditions.},
      cin          = {PGI-6},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/851779},
}