The effective field torque of an yttrium-iron-garnet (YIG) film on the spin accumulation in an attached platinum (Pt) film is measured by the spin-Hall magnetoresistance (SMR). As a result, the magnetization direction of a ferromagnetic insulating layer can be measured electrically. Experimental transverse and longitudinal resistances are well described by the theoretical model of SMR in terms of the direct and inverse spin-Hall effect, for different Pt thicknesses [3, 4, 8, and 35 nm]. Adopting a spin-Hall angle of Pt θSH = 0.08, we obtain the spin diffusion length of Pt (λ = 1.1 ± 0.3 nm) as well as the real (Gr= (7 ± 3) × 1014 Ω -1 m -2) and imaginary part (Gi = (5 ± 3) × 1013 Ω -1 m -2) of the spin-mixing conductance and their ratio (Gr/ Gi = 16 ± 4).
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)