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@ARTICLE{Kim:907113,
      author       = {Kim, Jun-young and Cramer, Joel and Lee, Kyujoon and Han,
                      Dong-Soo and Go, Dongwook and Salev, Pavel and Lapa, Pavel
                      N. and Vargas, Nicolas M. and Schuller, Ivan K. and
                      Mokrousov, Yuriy and Jakob, Gerhard and Kläui, Mathias},
      title        = {{T}uning {S}pin‐{O}rbit {T}orques {A}cross the {P}hase
                      {T}ransition in {VO} 2 /{N}i{F}e {H}eterostructure},
      journal      = {Advanced functional materials},
      volume       = {32},
      number       = {17},
      issn         = {1057-9257},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2022-01844},
      pages        = {2111555},
      year         = {2022},
      abstract     = {The emergence of spin-orbit torques as a promising approach
                      to energy-efficient magnetic switching has generated large
                      interest in material systems with easily and fully tunable
                      spin-orbit torques. Here, current-induced spin-orbit torques
                      in VO2/NiFe heterostructures are investigated using
                      spin-torque ferromagnetic resonance, where the VO2 layer
                      undergoes a prominent insulator-metal transition. A roughly
                      twofold increase in the Gilbert damping parameter, α, with
                      temperature is attributed to the change in the VO2/NiFe
                      interface spin absorption across the VO2 phase transition.
                      More remarkably, a large modulation $(±100\%)$ and a sign
                      change of the current-induced spin-orbit torque across the
                      VO2 phase transition suggest two competing spin-orbit torque
                      generating mechanisms. The bulk spin Hall effect in metallic
                      VO2, corroborated by the first-principles calculation of the
                      spin Hall conductivity σSH≈−104(ℏe)Ω−1  m−1,
                      is verified as the main source of the spin-orbit torque in
                      the metallic phase. The self-induced/anomalous torque in
                      NiFe, with opposite sign and a similar magnitude to the bulk
                      spin Hall effect in metallic VO2, can be the other competing
                      mechanism that dominates as temperature decreases. For
                      applications, the strong tunability of the torque strength
                      and direction opens a new route to tailor spin-orbit torques
                      of materials that undergo phase transitions for new device
                      functionalities.},
      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          = {5211 - Topological Matter (POF4-521)},
      pid          = {G:(DE-HGF)POF4-5211},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000743085600001},
      doi          = {10.1002/adfm.202111555},
      url          = {https://juser.fz-juelich.de/record/907113},
}