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@ARTICLE{Azpiroz:819904,
      author       = {Azpiroz, Julen Ibanez and dos Santos Dias, Manuel and
                      Blügel, Stefan and Lounis, Samir},
      title        = {{Z}ero-{P}oint {S}pin-{F}luctuations of {S}ingle {A}datoms},
      journal      = {Nano letters},
      volume       = {16},
      number       = {7},
      issn         = {1530-6992},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2016-05480},
      pages        = {4305 - 4311},
      year         = {2016},
      abstract     = {Stabilizing the magnetic signal of single adatoms is a
                      crucial step toward their successful usage in widespread
                      technological applications such as high-density magnetic
                      data storage devices. The quantum mechanical nature of these
                      tiny objects, however, introduces intrinsic zero-point
                      spin-fluctuations that tend to destabilize the local
                      magnetic moment of interest by dwindling the magnetic
                      anisotropy potential barrier even at absolute zero
                      temperature. Here, we elucidate the origins and quantify the
                      effect of the fundamental ingredients determining the
                      magnitude of the fluctuations, namely, the (i) local
                      magnetic moment, (ii) spin–orbit coupling, and (iii)
                      electron–hole Stoner excitations. Based on a systematic
                      first-principles study of 3d and 4d adatoms, we demonstrate
                      that the transverse contribution of the fluctuations is
                      comparable in size to the magnetic moment itself, leading to
                      a remarkable $≳50\%$ reduction of the magnetic anisotropy
                      energy. Our analysis gives rise to a comprehensible diagram
                      relating the fluctuation magnitude to characteristic
                      features of adatoms, providing practical guidelines for
                      designing magnetically stable nanomagnets with minimal
                      quantum fluctuations.},
      cin          = {IAS-1 / PGI-1 / JARA-FIT / JARA-HPC},
      ddc          = {540},
      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)},
      pid          = {G:(DE-HGF)POF3-142 / G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000379794200048},
      pubmed       = {pmid:27248465},
      doi          = {10.1021/acs.nanolett.6b01344},
      url          = {https://juser.fz-juelich.de/record/819904},
}