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@ARTICLE{Oppeneer:43182,
      author       = {Oppeneer, P. and Liebsch, A.},
      title        = {{U}ltra-fast demagnetization in {N}i: {T}heory of
                      magneto-optics for non-equilibrium electron distributions},
      journal      = {Journal of physics / Condensed matter},
      volume       = {16},
      issn         = {0953-8984},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PreJuSER-43182},
      pages        = {5519},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The sensitivity of the magneto-optical Kerr response to
                      electronic thermalization processes in ultrafast pump-probe
                      experiments is studied by OF evaluating the complex
                      conductivity tensor of Ni for non-equilibrium electron
                      distributions. The electronic structure and optical matrix
                      elements are calculated within density functional theory. To
                      account for the electronic redistributions generated by the
                      intense pump-laser pulse during the initial stages of
                      electronic thermalization, two kinds of model electron
                      distributions are considered which mimic the so-called
                      dichroic bleaching or state-blocking effect. Thus, certain
                      optical transitions which are allowed under equilibrium
                      conditions are not accessible to the probe laser. It is
                      shown that the conductivity tensor and the complex Kerr
                      angle can be modified substantially by the non-equilibrium
                      electron distributions. Moreover, in striking contrast to
                      the case for ordinary equilibrium conditions, the Kerr
                      rotation and ellipticity are no longer proportional to the
                      magnetization of the sample. The Kerr response at ultrashort
                      times can therefore not be taken as a measure of
                      demagnetization.},
      keywords     = {J (WoSType)},
      cin          = {IFF-TH-I},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB30},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK242},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000223431300019},
      doi          = {10.1088/0953-8984/16/30/013},
      url          = {https://juser.fz-juelich.de/record/43182},
}