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@BOOK{Grychtol:136289,
      author       = {Grychtol, Patrik},
      title        = {{E}lement-selective and time-resolved magnetic
                      investigations in the extreme ultraviolet range},
      volume       = {22},
      school       = {Universtät Duisburg},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-136289},
      isbn         = {978-3-89336-706-1},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Schlüsseltechnologien / key technologies},
      pages        = {XII, 144 S.},
      year         = {2011},
      note         = {Record converted from JUWEL: 18.07.2013; Universität
                      Duisburg, Diss., 2011},
      abstract     = {The objective of this thesis is to explore the potential of
                      the extreme ultraviolet (EUV) region to serve as an
                      element-selective and magnetic contrast mechanism for
                      magnetooptical investigations. To this end, the following
                      work focuses on alloy and multilayer model systems based on
                      iron, cobalt and nickel due to their high relevance for both
                      xfundamental research and technology. Four reectivity
                      experiments exploiting the transversal magneto-optical Kerr
                      effect (T-MOKE) have been performed by tuning the photon
                      energy to the $\textit{M}$ absorption edges of the
                      respective 3d transition ferromagnets and by employing
                      synchrotron as well as laser based soft x-ray light sources.
                      In the first experiment spatially separated but homogeneous
                      and ferromagnetically coupled layers in a wedged Co(5
                      nm)/Si(1-4 nm)/Ni(8 nm)/Fe(2 nm) multilayer are studied,
                      whereas the second experiment is concerned with
                      magneto-optical investigations of a single
                      Ni$_{80}$Fe$_{20}$(5 nm)/Cr(0.6 nm)/Co$_{40}$Fe$_{60}$(10
                      nm) multilayer containing two anti-ferromagnetically coupled
                      heterogeneous ferromagnetic layers. Measurements and
                      supporting simulations of the magneto-optical response as a
                      function of the photon energy, the incidence angle and the
                      spacer thickness explore the character of the
                      magneto-dichroic signal in the EUV and its potential for
                      layer-selective investigations. A magnetic contrast as high
                      as 80\% can be obtained and the recorded hysteresis loops
                      prove that the switching of single layers can indeed be
                      measured layer-selectively. In the third experiment,
                      precessional dynamics of the magnetization in thin permalloy
                      films patterned to form a coplanar waveguide is induced by
                      ultrashort laser pulses. The resulting oscillatory response
                      is probed by synchronized EUV pulses originating from a
                      synchrotron tuned to the $\textit{M}$ absorption edge of Ni.
                      The obtained results in combination with reference
                      measurements in the visible range not only prove the
                      feasibility, but also explore the limitations of this
                      pump-probe approach. The fourth experiment is concerned with
                      the ultrafast demagnetization of permalloy, which is
                      optically driven by intense laser pulses. A magnetic
                      contrast of 30\% can be exploited to element-selectively
                      probe the evolution of the magnetic system by EUV pulses
                      from a table-top soft x-ray source with an unprecedented
                      temporal resolution. The result suggests that the local spin
                      environment at the atomic level plays a vital role in the
                      dynamic response of magnetic materials, and must be included
                      for a complete understanding of the microscopic physics
                      underlying demagnetization processes.},
      cin          = {PGI-6},
      ddc          = {500},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      shelfmark    = {FHAB - Surface and thin film characterization / FGN -
                      Nanotechnology / FJB - Electric materials},
      typ          = {PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/136289},
}