Enhanced spin-to-charge current conversion at metal/oxide interfaces by lowering the temperature

Abstract

We investigated the temperature dependence of the spin-to-charge current conversion at nonmagnetic metal (NM: Cu or Ag)/Bi2O3 interfaces with Rashba spin-splitting. Spin pumping induced inverse Edelstein effects are measured in the temperature range from 290 K to 10 K. Estimated conversion coefficients at the Cu(Ag)/Bi2O3 interfaces are increased by 40 (17)% at 10 K compared with those at 290 K. The conversion coefficient is found to be proportional to the conductivity of the NM layer, indicating that the momentum relaxation process in the metal layer dominates the spin-to-charge current conversion process at NM/Bi2O3 interfaces.