Evidence for phonon skew scattering in the spin Hall effect of platinum

Gurucharan V. Karnad, Cosimo Gorini, Kyujoon Lee, Tomek Schulz, Roberto Lo Conte, A. W. J. Wells, Dong-So Han, Kowsar Shahbazi, Jun-Seo Kim, T. A. Moore, H. J. M. Swagten, Ulrich Eckern, Roberto Raimondi & Mathias Kläui
We measure and analyze the effective spin Hall angle of platinum in the low-residual resistivity regime by second-harmonic measurements of the spin-orbit torques for a multilayer of Pt vertical bar Co vertical bar AlOx. An angular-dependent study of the torques allows us to extract the effective spin Hall angle responsible for the damping-like torque in the system. We observe a strikingly nonmonotonic and reproducible temperature dependence of the torques. This behavior is compatible with recent...
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