Abstract
The charge-to-spin conversion in Bi/Ag bilayer is studied by spin-torque ferromagnetic resonance experimentally. Fe and permalloy layers sandwich the Bi/Ag bilayer in a multilayer structure, which allows the injection of spin current generated in the Bi/Ag bilayer into the two ferromagnetic layers from opposite directions. The spin Hall effect and the Rashba–Edelstein effect in Bi/Ag are expected to show qualitatively different spin-torque ferromagnetic resonance signals in such a setup. The results show the dominant contribution from the spin Hall effect rather than the Rashba–Edelstein effect, consistent with our recent finding of the spin-to-charge conversion in Bi/Ag bilayer (Shen et al., 2021).
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