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Manipulation of the magnetization in heavy-metal/ferromagnetic bilayers viathe spin-orbit torque requires high spin Hall conductivity of the heavy metal.We measure inverse spin Hall voltage using a co-planar wave-guide basedbroadband ferromagnetic resonance set-up in Py/Ta system with varyingcrystalline phase of Ta. We demonstrate a strong correlation between themeasured spin mixing conductance and spin Hall conductivity with thecrystalline phase of Ta thin films. We found a large spin Hall conductivity of$-2439~(\hbar/e)~\Omega^{-1}$cm$^{-1}$ for low-resistivity (68 $\mu\Omega-$cm)Ta film having mixed crystalline phase, which we attribute to an extrinsicmechanism of the spin Hall effect.

Large spin current generation by the spin Hall effect in mixed crystalline phase Ta thin films