Exchange magnetic field torques in YIG/Pt bilayers observed by the spin-Hall magnetoresistance

N. Vlietstra; J. Shan; V. Castel; J. Ben Youssef; G. E. W. Bauer; B. J. van Wees

doi:10.1063/1.4813760

paper

Exchange magnetic field torques in YIG/Pt bilayers observed by the spin-Hall magnetoresistance

arXiv:1305.3117 · doi:10.1063/1.4813760

Abstract

The effective field torque of an yttrium-iron-garnet film on the spin accumulation in an attached 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 35nm]. Adopting a spin-Hall angle of Pt $θ_{S H} = 0.08$ , we obtain the spin diffusion length of Pt ( $λ = 1.1 \pm 0.3$ nm) as well as the real ( $G_{r} = (7 \pm 3) \times 1 0^{14} Ω^{- 1}$ m $^{- 2}$ ) and imaginary part ( $G_{i} = (5 \pm 3) \times 1 0^{13} Ω^{- 1}$ m $^{- 2}$ ) of the spin-mixing conductance and their ratio ( $G_{r} / G_{i} = 16 \pm 4$ ).

4 pages, 4 figures

Exchange magnetic field torques in YIG/Pt bilayers observed by the spin-Hall magnetoresistance

Abstract

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