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@ARTICLE{Perroni:57121,
      author       = {Perroni, C. A. and Liebsch, A.},
      title        = {{M}agnetization dynamics in dysprosium orthoferrites via
                      the inverse {F}araday effect},
      journal      = {Physical review / B},
      volume       = {74},
      number       = {13},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-57121},
      pages        = {134430},
      year         = {2006},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The ultrafast nonthermal control of magnetization has
                      recently become feasible in canted antiferromagnets through
                      photomagnetic instantaneous pulses [A. V. Kimel , Nature
                      435, 655 (2005)]. In this experiment, circularly polarized
                      femtosecond laser pulses set up a strong magnetic field
                      along the wave vector of the radiation through the inverse
                      Faraday effect, thereby exciting nonthermally the spin
                      dynamics of dysprosium orthoferrites. A theoretical study is
                      performed by using a model for orthoferrites based on a
                      general form of free energy whose parameters are extracted
                      from experimental measurements. The magnetization dynamics
                      is described by solving coupled sublattice
                      Landau-Lifshitz-Gilbert equations whose damping term is
                      associated with the scattering rate due to magnon-magnon
                      interaction. Due to the inverse Faraday effect and the
                      nonthermal excitation, the effect of the laser is simulated
                      by magnetic-field Gaussian pulses with temporal width of the
                      order of 100 fs. When the field is along the z axis, a
                      single resonance mode of the magnetization is excited. The
                      amplitude of the magnetization and out-of-phase behavior of
                      the oscillations for fields in the z and -z directions are
                      in good agreement with the cited experiment. The analysis of
                      the effect of the temperature shows that the magnon-magnon
                      scattering mechanism affects the decay of the oscillations
                      on the picosecond scale. Finally, when the field pulse is
                      along the x axis, another mode is excited, as observed in
                      experiments. In this case, a comparison between theoretical
                      and experimental results shows some discrepancies, the
                      origin of which is related to the role played by
                      anisotropies in orthoferrites.},
      keywords     = {J (WoSType)},
      cin          = {IFF-TH-I},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB30},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK414},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000241723200081},
      doi          = {10.1103/PhysRevB.74.134430},
      url          = {https://juser.fz-juelich.de/record/57121},
}