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@PHDTHESIS{Pltzing:819167,
      author       = {Plötzing, Moritz Alexander},
      title        = {{L}aser-{I}nduced {U}ltrafast {E}lectron- and
                      {S}pin-{D}ynamics in the {E}lectronic {B}and {S}tructure of
                      {C}o(001)},
      volume       = {131},
      school       = {Universität Duisburg},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2016-04878},
      isbn         = {978-3-95806-168-2},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Schlüsseltechnologien / Key Technologies},
      pages        = {II, 109, XXXIV S.},
      year         = {2016},
      note         = {Universität Duisburg, Diss., 2016},
      abstract     = {In the last two decades, ultrafast magnetization dynamics
                      has been the subject of a large number of experimental and
                      theoretical investigations, however, without establishing a
                      consistent picture up to now. The objective of the work
                      presented in this thesis is to provide a new and profound
                      perspective on the underlying mechanisms by a direct
                      observation of the spin-dynamics in the electronic band
                      structure of 3$\textit{d}$ ferromagnets using femtosecond
                      time- and spin-resolved photoelectron spectroscopy of the
                      full energy range of the valence bands. For this purpose, a
                      novel experimental setup has been developed and commissioned
                      that combines a modern, highly effcient spin detector with a
                      state-of-the-art, table-top light source creating ultrashort
                      extreme ultraviolet (XUV) pulses by laser-based high-order
                      harmonic generation (HHG). The light source can be used in
                      two operation modes, which provide XUV radiation with
                      different wavelengths and photon fluxes. Static
                      spin-resolved photoemission spectra of Co(001) films have
                      been measured in both operation modes to find the optimum
                      conditions for time-resolved experiments. Moreover, vacuum
                      space-charge (VSC) effects within the dense electron clouds
                      emitted by the femtosecond XUV pulses as well as the Coulomb
                      interaction between electron clouds generated by XUV probe-
                      and near-infrared (NIR) pump-pulses in a pump-probe
                      experiment have been investigated in detail. The findings
                      are used to determine and later minimize the influence of
                      VSC on photoemission results. The NIR pump-pulses have been
                      employed in time-resolved measurements to trigger ultrafast
                      demagnetization in Co samples. Using the capabilities of the
                      new experiment, we monitored the time evolution of the
                      electron-dynamics by measuring spin-resolved spectra over a
                      broad energy range fully covering the valence bands. To our
                      knowledge, such measurements have been performed for the
                      first time. The experiments lead to novel insights into the
                      evolution of the spin system during an ultrafast
                      demagnetization process, in particular by showing evidence
                      of spin-mixing instead of a quenching of the exchange
                      splitting as suggested by the Stoner-model.},
      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)11},
      url          = {https://juser.fz-juelich.de/record/819167},
}