Abstract
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−1m−2) and imaginary part (Gi=(5±3)×1013 Ω−1m−2) of the spin-mixing conductance and their ratio (Gr/Gi=16±4).
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