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@PHDTHESIS{DosSantos:873878,
      author       = {Dos Santos, Flaviano José},
      title        = {{F}irst-principles study of collective spin excitations in
                      noncollinear magnets},
      volume       = {212},
      school       = {RWTH Aachen},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2020-01070},
      isbn         = {978-3-95806-459-1},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Schlüsseltechnologien / Key Technologies},
      pages        = {270 S.},
      year         = {2020},
      note         = {RWTH Aachen, Diss., 2019},
      abstract     = {The pace of the current data revolution depends on the
                      world's technological capability to store and process
                      information. A great share of that is done by manipulating
                      magnetic materials with astonishing speed and precision,
                      which involves several dynamical processes. Among the latter
                      are the collective spin excitations known as spin waves.
                      Just like the strings of a guitar, spin waves are the
                      natural "tunes" of a material's magnetization, and knowing
                      their properties allows to predict, design and control
                      technological devices. In this thesis, we study the
                      properties of spin waves in complex magnets focusing on
                      systems of low-dimensionality. The manifestation of spin
                      waves in collinear magnets, such as ferromagnets, has been
                      extensively investigated. However, spin waves in
                      noncollinear magnets are not fully understood yet. For
                      instance, no experimental data is available concerning
                      large-wavevector spin waves in thin films and surfaces.
                      Nevertheless, novel noncollinear spin textures, such as the
                      topologically nontrivial skyrmions, are at the heart of many
                      recent proposals of information nanotechnologies for the
                      future. Therefore, we develop in this thesis an atomistic
                      description of the spin waves in noncollinear magnets
                      applicable to real materials. We achieve that by combining
                      the density functional theory, as implemented within the
                      Korringa-Kohn-Rostoker method, with the spin-wave adiabatic
                      approximation. Effectively, we parametrize from
                      first-principles a generalized quantum Heisenberg
                      Hamiltonian accounting for relativistic effects of the
                      spin-orbit coupling. Thus, besides calculating the magnetic
                      exchange interaction, we also have access to the
                      Dzyaloshinskii-Moriya interaction(DMI) and the magneto
                      crystalline anisotropy. To further relate our results with
                      experimental works, we calculate the
                      inelastic-electron-scattering spectrum using timedependent
                      perturbation theory. This led us to propose spin-resolved
                      electron-energy-loss spectroscopy (SREELS) as an
                      experimental tool to probe large-wavevector spin waves in
                      noncollinear magnets. [...]},
      cin          = {PGI-1 / IAS-1 / JARA-FIT / JARA-HPC},
      cid          = {I:(DE-Juel1)PGI-1-20110106 / I:(DE-Juel1)IAS-1-20090406 /
                      $I:(DE-82)080009_20140620$ / $I:(DE-82)080012_20140620$},
      pnm          = {142 - Controlling Spin-Based Phenomena (POF3-142)},
      pid          = {G:(DE-HGF)POF3-142},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/873878},
}