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@MASTERSTHESIS{Marotzke:475618,
      author       = {Marotzke, Simon},
      othercontributors = {Gruebel, Gerhard and Rossnagel, Kai},
      title        = {{I}nvestigation of the magnetic and electronic properties
                      of topological insulator/ferromagnet heterostructures},
      school       = {University of Hamburg},
      type         = {Masterarbeit},
      reportid     = {PUBDB-2022-01378},
      pages        = {105},
      year         = {2022},
      note         = {Masterarbeit, University of Hamburg, 2021},
      abstract     = {In recent years, the application of topological principles
                      in physics has paved the way for the discovery of a wide
                      range of topological materials with potential applications
                      in spintronics, zero-resistance materials and quantum
                      computing. Hereby, heterostructures with topological
                      insulators (TIs) as one component and a magnetic material as
                      another play an important role as new topological phases
                      have been predicted in these systems. One idea is that a
                      topological phase transition could be realized by
                      manipulating the magnetic state. To this aim, a precise
                      understanding of the magnetic and electronic properties of
                      such heterostructures is required.In this thesis,
                      topological insulator/ferromagnet heterostructures
                      consisting of the topological insulator Bi$_2$Se$_3$ and a
                      ferromagnetic overlayer X/Co/Pt, with X = None, Pt, B$_4$C
                      and B$_4$C/Pt, are investigated. The magnetic
                      characterization via the magneto-optical Kerr effect reveal
                      that the magnetic properties of the overlayer can be set by
                      varying the sample design as well as the thickness of the
                      individual layers. Particularly, overlayers that either
                      exhibit perpendicular magnetic anisotropy with full or no
                      remanence are identified. In the measurements of the
                      electronic properties of the heterostructures via X-ray
                      photoemission spectroscopy, two Bi phases are identified. By
                      systematically varying the photon energy, the depth, in
                      which the two Bi phases are located in the heterostructures,
                      is analyzed. Possible reasons for the existence of two Bi
                      phases as well as suggestions for necessary future
                      investigations in order to expand the knowledge on the
                      electronic and structural properties of the heterostructures
                      are discussed. Finally, a scheme to invert the
                      heterostructures is presented and tested via X-ray
                      photoemission spectroscopy. This scheme has the potential of
                      achieving momentum resolution in angle-resolved
                      photoemission spectroscopy measurements of topological
                      insulators in proximity to a ferromagnetic layer. Thus, the
                      influence of the manipulation of the magnetization in the
                      overlayer on the topological insulator could be investigated
                      in future, possibly realizing a magnetic switch for a
                      topological phase transition.},
      cin          = {CFEL-UDSS / FS-CXS / FS-SXQM},
      cid          = {I:(DE-H253)CFEL-UDSS-20160914 / I:(DE-H253)FS-CXS-20130727
                      / I:(DE-H253)FS-SXQM-20190201},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      FS-Proposal: I-20200269 (I-20200269) / FS-Proposal:
                      I-20210224 (I-20210224)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20200269 / G:(DE-H253)I-20210224},
      experiment   = {EXP:(DE-H253)P-P04-20150101},
      typ          = {PUB:(DE-HGF)19},
      url          = {https://bib-pubdb1.desy.de/record/475618},
}