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@PHDTHESIS{Riepp:470997,
      author       = {Riepp, Matthias},
      othercontributors = {Gruebel, Gerhard},
      title        = {{M}ulti-{S}cale {S}tudy of {A}ll-{O}ptically {I}nduced
                      {M}agnetization {D}ynamics in {C}o/{P}t {M}ultilayers
                      utilizing {TR}-m{SAXS} at {FEL} {S}ources},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron DESY},
      reportid     = {PUBDB-2021-04314, DESY-THESIS-2021-018},
      series       = {DESY-THESIS},
      pages        = {210},
      year         = {2021},
      note         = {Dissertation, Universität Hamburg, 2021},
      abstract     = {This thesis deals with the impact of ultrashort
                      near-infrared~(nIR) and extreme ultraviolet~(XUV) laser
                      pulses on the magnetic multi-domain states of particularly
                      thin Co/Pt multilayers. The laser induced magnetization
                      dynamics are investigated with femtosecond time and
                      nanometer spatial resolution utilizing time-resolved
                      magnetic small-angle X-ray scattering~(TR-mSAXS) at the
                      free-electron lasers~(FEL) FLASH in Hamburg and
                      FERMI@Elettra in Trieste.One part of the thesis deals with
                      ultrafast demagnetization in three different
                      Co/Pt-multilayer samples with total film thicknesses in the
                      range of the attenuation length of nIR radiation in Co and
                      Pt. For excitation of the magnetic states, nIR-laser pulses
                      of different fluence, pulse duration and polarization are
                      used, addressing important aspects of ultrafast
                      demagnetization in such optically thin Co/Pt multilayers,
                      for the first time, by resonant magnetic scattering. In
                      particular, a model that accounts for both the
                      low-temperature behavior of the remagnetization dynamics and
                      its drastic slowing down at high temperatures is proposed,
                      taking into account recent theoretical predictions. Within
                      this model, the remagnetization dynamics are described via
                      energy exchange between a strongly coupled electron-spin
                      system and the phonon system.Another part of the thesis
                      addresses the influence of nIR and XUV-laser~(FEL) pulses on
                      the lateral configuration of nanoscopic multi-domain states.
                      Different multi-domain states are generated in a selected
                      Co/Pt multilayer by using out-of-plane~(OOP) magnetic
                      fields. Aside from ultrafast demagnetization, that behaves
                      similar for the different multi-domain states, permanent
                      lateral domain modifications forming on longer time scales
                      are observed, that do depend on the underlying multi-domain
                      state. Moreover, the permanent modifications only occur if
                      nIR and XUV-laser pulses temporally overlap. Since the
                      action of the combined~(pump/probe) peak intensity alone
                      cannot explain the observed effects, it is concluded that
                      the permanent modifications also depend on the photon
                      energies of the laser pulses. In particular, the permanent
                      modifications in the close-to single-domain state point at
                      laser induced nucleation processes and thus a novel
                      all-optical switching~(AOS) like mechanism that is based on
                      the interplay of two different laser excitations.},
      cin          = {FS-CXS},
      cid          = {I:(DE-H253)FS-CXS-20130727},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G2 - FLASH (DESY) (POF4-6G2) / 6G3 -
                      PETRA III (DESY) (POF4-6G3) / PHGS, VH-GS-500 - PIER
                      Helmholtz Graduate School $(2015_IFV-VH-GS-500)$},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G2 /
                      G:(DE-HGF)POF4-6G3 / $G:(DE-HGF)2015_IFV-VH-GS-500$},
      experiment   = {EXP:(DE-H253)F-BL3-20150101 / EXP:(DE-MLZ)External-20140101
                      / EXP:(DE-H253)P-P04-20150101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2021-04314},
      url          = {https://bib-pubdb1.desy.de/record/470997},
}