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@PHDTHESIS{Kaiser:5064,
      author       = {Kaiser, Alexander},
      title        = {{M}agnetization dynamics in magnetically coupled
                      heterostructures},
      volume       = {5},
      school       = {Universität Duisburg-Essen},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülch GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-5064},
      isbn         = {978-3-89336-577-7},
      series       = {Schriften des Forschungszentrums Jülich. Information /
                      Information},
      pages        = {X, 121 S.},
      year         = {2009},
      note         = {Record converted from VDB: 12.11.2012; Universität
                      Duisburg-Essen, Diss., 2009},
      abstract     = {This thesis focusses on the influence of interlayer
                      coupling on the magnetization dynamics of heterostructure
                      systems. This topic has been investigated by time-resolved
                      photoemission electron microscopy (PEEM) using a pump-probe
                      approach. Magnetic and chemical contrast is provided by the
                      llumination with circularly polarized x-rays due to the
                      x-ray magnetic circular dichroism (XMCD) effect. In this way
                      the spatially resolved magnetodynamic response of the single
                      layers in asymmetric trilayer samples on short magnetic
                      field pulses was studied. The measurements have been carried
                      out at the electron storage rings ESRF (Grenoble) and
                      BESSY-II (Berlin). Samples with different material
                      combinations have been deposited by molecular beam
                      evaporation (MBE) and magnetron sputtering and subsequently
                      micro-structured by optical lithography and Argon ion beam
                      milling. Combining PEEM and magnetooptical Kerr effect
                      (MOKE) studies the coupling conditions have been
                      investigated. In CoFe/Cr/ NiFe and Fe/Cr/Co systems
                      oscillatory interlayer exchange coupling depending on the Cr
                      spacer thickness was found, while the Heusler-based
                      Co$_{2}$MnSi/MgOCo$_{2}$FeSi system showed a
                      roughness-induced orange-peel coupling. Time-resolved
                      measurements have been carried out on single films and
                      interlayer exchange coupled trilayers. In single-crystalline
                      iron films the influence of the agnetocrystalline anisotropy
                      on the magnetodynamic response was studied. A bulging of the
                      domain walls was found experimentally and in micromagnetic
                      simulations. This effect is discussed in terms of an
                      inhomogeneous demagnetizing field within the magnetic
                      elements. In heterostructures the competition between single
                      film properties such as shape and magnetocrystalline
                      anisotropy and the interlayer exchange coupling was studied.
                      The single films showed an inhomogeneous response with a
                      locally varying coupling strength due to locally enhanced
                      magnetic stray fields at domain walls or defects. The
                      results are discussed in terms of the local energy
                      contributions. By varying the temporal shape of the
                      excitation field different magnetodynamic reactions have
                      been investigated. Using short magnetic field pulses
                      magnetic eigenmodes have been excited that have been
                      reproduced by macro-spin calculations. The frequency of the
                      eigenmode was found to be considerably increased due to the
                      interlayer coupling.},
      cin          = {IFF-9},
      cid          = {I:(DE-Juel1)VDB789},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/5064},
}