Spin Pumping and Inverse Spin Hall Effect in Platinum: The Essential Role of Spin-Memory Loss at Metallic Interfaces

Abstract

Through combined ferromagnetic resonance, spin-pumping and inverse spin Hall effect experiments in Co|Pt bilayers and Co|Cu|Pt trilayers, we demonstrate consistent values of spin diffusion length ${\ell }_{\mathrm{sf}}^{\mathrm{Pt}}=3.4\pm 0.4$ nm and of spin Hall angle ${\theta }_{\mathrm{SHE}}^{\mathrm{Pt}}=0.051\pm 0.004$ for Pt. Our data and model emphasize on the partial depolarization of the spin current at each interface due to spin-memory loss. Our model reconciles the previously published spin Hall angle values and explains the different scaling lengths for the ferromagnetic damping and the spin Hall effect induced voltage.

6 pages, 3 figures (main text) and 8 pages supplementary. Published with small modifications in Phys. Rev. Lett

References in corpus (1)

• Spin Hall Angle Quantification from Spin Pumping and Microwave Photoresistance

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