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@INPROCEEDINGS{Freimuth:830168,
      author       = {Freimuth, Frank},
      title        = {{S}pin-orbit torques in noncollinear magnets from
                      first-principles density-functional theory},
      reportid     = {FZJ-2017-03744},
      year         = {2017},
      abstract     = {While spin-orbit torques [1] in magnetic bilayers composed
                      of a 5d transition metal layer and a ferromagnetic layer can
                      serve as a competitive alternative to the Slonczewski
                      spin-transfer torque in spin-valves and magnetic tunnel
                      junctions in order to realize MRAM devices, spin-orbit
                      torques have even more potential, and are a potential
                      game-changer, in antiferromagnetic spintronics [2] and in
                      noncollinear magnets. In this talk we will focus on
                      current-induced torques and spin-orbit driven effects in
                      noncollinear magnetic bilayers. The combination of
                      structural inversion asymmetry present in the bilayer
                      geometry with noncollinear magnetism leads to several
                      additional spin-orbit driven effects, such as the
                      Dzyaloshinskii-Moriya interaction [3,4,5,6] and chiral
                      damping [7], which join the other effects and
                      current-induced torques important in noncollinear magnets
                      and magnetic bilayers, such as spin-transfer torque,
                      spin-orbit torque and nonadiabatic torque. In particular the
                      combined action of the Dzyaloshinskii-Moriya interaction and
                      the spin-orbit torque from the spin Hall effect enables
                      current-driven domain-wall motion at ultrahigh speeds [8,9].
                      The large number of current-induced torques and spin-orbit
                      driven effects participating in the current-induced motion
                      of domain-walls or skyrmions are difficult to disentangle
                      and to quantify in experimental measurements.
                      First-principles density functional theory is an ideal tool
                      to understand and to quantify these effects. For this
                      purpose we extend our computational formalism of spin-orbit
                      torques [10,11] to noncollinear magnets. An important
                      problem in the formalism development concerns the correct
                      inclusion of vertex corrections, without which several
                      components of the current-induced torques in noncollinear
                      chiral magnets would violate conservation laws. We will
                      discuss the current-induced torques and spin-orbit driven
                      effects that arise from the combination of structural
                      inversion asymmetry, spin-orbit coupling, and noncollinear
                      magnetism in Co/Pt and Mn/W bilayer systems.},
      month         = {May},
      date          = {2017-05-04},
      organization  = {EMN Summer Meeting 2017, Havana
                       (Cuba), 4 May 2017 - 7 May 2017},
      subtyp        = {Invited},
      cin          = {IAS-1 / PGI-1 / JARA-FIT / JARA-HPC},
      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)6},
      url          = {https://juser.fz-juelich.de/record/830168},
}