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@ARTICLE{Guimaraes:838224,
      author       = {Guimaraes, Filipe and dos Santos Dias, Manuel and
                      Schweflinghaus, Benedikt and Lounis, Samir},
      title        = {{E}ngineering elliptical spin-excitations by complex
                      anisotropy fields in {F}e adatoms and dimers on {C}u(111)},
      journal      = {Physical review / B},
      volume       = {96},
      number       = {14},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2017-06886},
      pages        = {144401},
      year         = {2017},
      abstract     = {We investigate the dynamics of Fe adatoms and dimers
                      deposited on the Cu(111) metallic surface in the presence of
                      spin-orbit coupling, within time-dependent density
                      functional theory. The ab initio results provide
                      material-dependent parameters that can be used in
                      semiclassical approaches, which are used for insightful
                      interpretations of the excitation modes. By manipulating the
                      surroundings of the magnetic elements, we show that
                      elliptical precessional motion may be induced through the
                      modification of the magnetic anisotropy energy. We also
                      demonstrate how different kinds of spin precession are
                      realized, considering the symmetry of the magnetic
                      anisotropy energy, the ferro- or antiferromagnetic nature of
                      the exchange coupling between the impurities, and the
                      strength of the magnetic damping. In particular, the normal
                      modes of a dimer depend on the initial magnetic
                      configuration, changing drastically by going from a
                      ferromagnetic metastable state to the antiferromagnetic
                      ground state. By taking into account the effect of the
                      damping into their resonant frequencies, we reveal that an
                      important contribution arises for strongly biaxial systems
                      and specially for the antiferromagnetic dimers with large
                      exchange couplings. Counterintuitively, our results indicate
                      that the magnetic damping influences the quantum
                      fluctuations by decreasing the zero-point energy of the
                      system.},
      cin          = {IAS-1 / PGI-1 / JARA-FIT / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)PGI-1-20110106 /
                      $I:(DE-82)080009_20140620$ / $I:(DE-82)080012_20140620$},
      pnm          = {142 - Controlling Spin-Based Phenomena (POF3-142)},
      pid          = {G:(DE-HGF)POF3-142},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000412029200003},
      doi          = {10.1103/PhysRevB.96.144401},
      url          = {https://juser.fz-juelich.de/record/838224},
}