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  • Gupta, Rahul, et al. (author)
  • Element-resolved evidence of superdiffusive spin current arising from ultrafast demagnetization process
  • 2023
  • In: Phys. Rev. B. - : American Physical Society. ; 108:6
  • Journal article (peer-reviewed)abstract
    • Using element-specific measurements of the ultrafast demagnetization of Ru/Fe65Co35 hetero-structures, we show that Ru can exhibit a significant magnetic contrast (3% asymmetry) resulting from ultrafast spin currents emanating from the demagnetization process of the FeCo layer. We use this magnetic contrast to investigate how superdiffusive spin currents are affected by the doping of heavy elements in the FeCo layer. We find that the spin currents are strongly suppressed, and that the recovery process in Ru slows down by Re doping. This is in accordance with a change in interface reflectivity of spin currents as found by the superdiffusive spin transport model.
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