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@PHDTHESIS{Jugovac:884797,
      author       = {Jugovac, Matteo},
      title        = {{M}orphology and electronic structure of graphene supported
                      by metallic thin films},
      volume       = {224},
      school       = {Universität Duisburg},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2020-03259},
      isbn         = {978-3-95806-498-0},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Schlüsseltechnologien / Key Technologies},
      pages        = {XI, 151 S.},
      year         = {2020},
      note         = {Universität Duisburg, Diss., 2020},
      abstract     = {The increasing demand for data storage capacity and the
                      environmental sustainability of electronic storage devices
                      ask for the use of innovative technologies. Extensive
                      production of such devices encounters an economical barrier,
                      where a low production cost is fundamental for a sustainable
                      production chain. The use of graphene both as
                      functionalizing and as passivating layer emerged as a
                      solution matching the demands listed above. It shifted the
                      interest of the scientific community in the past decade
                      towards the optimization of graphene growth, using a variety
                      of different approaches. In this thesis, a multi-technique
                      characterization of single-layer graphene growth on top of
                      ferromagnetic supports is reported. Preceding the graphene
                      growth, characterization of the temperature-dependent
                      thickness behavior of thin metallic films allowed for the
                      optimization of their quality, followed by the investigation
                      of the electronic properties of the metal films. The
                      substrate was chosen as cobalt both from geometrical
                      reasons, i.e. lattice mismatch, as well as better
                      suitability to the experimental setup used. Using spatially
                      resolved techniques, the well-known Co martensitic phase
                      transition as a function of temperature has been observed
                      and characterized. On top of the cobalt support, the
                      chemical vapor deposition growth has been used for the
                      formation of a graphene monolayer, using ethylene as the
                      carbon supply. The graphene crystallographic quality varies
                      as a function of growth temperature showing different
                      azimuthal alignments with respect to the substrate. However,
                      in this thesis, it is demonstrated that a transformation
                      involving carbon exchange with the substrate allows
                      reverting the different configurations in an epitaxially
                      aligned graphene monolayer. The subsequent characterization
                      of the electronic structure reveals that the single
                      spin-polarized feature near the Fermi level, forming upon
                      graphene adsorption on cobalt, is a general characteristic
                      of the interface, independent on the relative orientation at
                      the graphene-cobalt interface. Having control over the
                      epitaxial relation between the graphene and the cobalt
                      substrate, modification of graphene-substrate interaction
                      can be achieved either by controlled substitutional
                      implantation of exospecies into the C lattice mesh or by
                      intercalation of foreign species. Therefore, in this thesis
                      the nitrogen substitution within the graphene lattice as
                      well as oxygen and gold intercalation at the graphene-Co
                      interface have been studied. The momentum mapping unravels
                      that the modification of the graphene-cobalt interaction
                      leads to the disappearance of the single spin-polarized band
                      in graphene.},
      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/884797},
}