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@ARTICLE{IbaezAzpiroz:851651,
      author       = {Ibañez-Azpiroz, Julen and dos Santos Dias, Manuel and
                      Blügel, Stefan and Lounis, Samir},
      title        = {{S}pin-fluctuation and spin-relaxation effects of single
                      adatoms from first principles},
      journal      = {Journal of physics / Condensed matter},
      volume       = {30},
      number       = {34},
      issn         = {1361-648X},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2018-05201},
      pages        = {343002},
      year         = {2018},
      abstract     = {Single adatoms offer an exceptional playground for studying
                      magnetism and its associated dynamics at the atomic scale.
                      Here we review recent results on single adatoms deposited on
                      metallic substrates, based on time-dependent density
                      functional theory. First we analyze quantum zero-point
                      spin-fluctuations (ZPSF) as calculated from the
                      fluctuation-dissipation theorem, and show how they affect
                      the magnetic stability by modifying the magnetic anisotropy
                      energy. We also assess the impact of ZPSF in the limit of
                      small hybridization to the substrate characteristic of
                      semi-insulating substrates, connecting to recent
                      experimental investigations where magnetic stability of a
                      single adatom was achieved for the first time. Secondly, we
                      inspect further the dynamics of single adatoms by
                      considering the longitudinal and transverse spin-relaxation
                      processes, whose time-scales are analyzed and related to the
                      underlying electronic structure of both the adatom and the
                      substrate. Thirdly, we analyze spin-fluctuation modes of
                      paramagnetic adatoms, i.e. adatoms where the Stoner
                      criterion for magnetism is almost fulfilled. Interestingly,
                      such modes can develop well-defined peaks in the meV range,
                      their main characteristics being determined by two
                      fundamental electronic properties, namely the Stoner
                      parameter and the density of states at the Fermi level.
                      Furthermore, simulated inelastic scanning tunneling
                      spectroscopy curves reveal that these spin-fluctuation modes
                      can be triggered by tunneling electrons, opening up
                      potential applications also for paramagnetic adatoms.
                      Lastly, an overview of the outstanding issues and future
                      directions is given.},
      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) / 143 -
                      Controlling Configuration-Based Phenomena (POF3-143) /
                      Calculation of quantum spin-fluctuations in nano-magnets
                      $(jias19_20161101)$},
      pid          = {G:(DE-HGF)POF3-142 / G:(DE-HGF)POF3-143 /
                      $G:(DE-Juel1)jias19_20161101$},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:30020083},
      UT           = {WOS:000440740900001},
      doi          = {10.1088/1361-648X/aad43d},
      url          = {https://juser.fz-juelich.de/record/851651},
}