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@ARTICLE{Fernandes:877500,
      author       = {Fernandes, Imara Lima and Chico, Jonathan and Lounis,
                      Samir},
      title        = {{I}mpurity-dependent gyrotropic motion, deflection and
                      pinning of current-driven ultrasmall skyrmions in
                      {P}d{F}e/{I}r(111) surface},
      journal      = {Journal of physics / Condensed matter},
      volume       = {32},
      number       = {42},
      issn         = {0953-8984},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2020-02250},
      pages        = {425802},
      year         = {2020},
      abstract     = {Resting on multi-scale modelling simulations, we explore
                      dynamical aspects characterizing magnetic skyrmions driven
                      by spin-transfer-torque towards repulsive and pinning 3d and
                      4d single atomic defects embedded in a Pd layer deposited on
                      the Fe/Ir(111) surface. The latter is known to host sub-10
                      nm skyrmions which are of great interest in information
                      technology. The Landau–Lifshitz–Gilbert equation is
                      parametrized with magnetic exchange interactions extracted
                      from the ab-initio all-electron full potential
                      Korringa–Kohn–Rostoker Green function method, where
                      spin–orbit coupling is added self-consistently. Depending
                      on the nature of the defect and the magnitude of the applied
                      magnetic field, the skyrmion deforms by either shrinking or
                      increasing in size, experiencing thereby elliptical
                      distortions. After applying a magnetic field of 10 T,
                      ultrasmall skyrmions are driven along a straight line
                      towards the various defects which permits a simple analysis
                      of the impact of the impurities. Independently from the
                      nature of the skyrmion-defect complex interaction, being
                      repulsive or pinning, a gyrotropic motion is observed. A
                      repulsive force leads to a skyrmion trajectory similar to
                      the one induced by an attractive one. We unveil that the
                      circular motion is clockwise around pinning impurities but
                      counter clockwise around the repulsive ones, which can be
                      used to identify the interaction nature of the defects by
                      observing the skyrmions trajectories. Moreover, and as
                      expected, the skyrmion always escapes the repulsive defects
                      in contrast to the pinning defects, which require a minimal
                      depinning current to observe impurity avoidance. This
                      unveils the richness of the motion regimes of skyrmions. We
                      discuss the results of the simulations in terms of the
                      Thiele equation, which provides a reasonable qualitative
                      description of the observed phenomena. Finally, we show an
                      example of a double track made of pinning impurities, where
                      the engineering of their mutual distance allows to control
                      the skyrmion motion with enhanced velocity.},
      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) /
                      First-principles investigation of single magnetic
                      nano-skyrmions $(jias17_20190501)$},
      pid          = {G:(DE-HGF)POF3-142 / $G:(DE-Juel1)jias17_20190501$},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:32541095},
      UT           = {WOS:000555869100001},
      doi          = {10.1088/1361-648X/ab9cf0},
      url          = {https://juser.fz-juelich.de/record/877500},
}