Experimental and Theoretical Evaluation for Pressure Effects on Spin Hall Effect in Pt

We have experimentally and theoretically investigated the influence of pressure on the spin Hall effect (SHE) for the Pt. The experimental results using a laterally configured Pt/CoFeB hybrid nanostructure suggest that the spin Hall angle for the Pt is almost constant under pressure up to 2 GPa. The theoretical study based on the first-principles calculation found the spin Hall conductivity for the Pt shows a 10% reduction due to the pressure application of 75 GPa, supporting the experimental results. These results imply that the enhanced spin Hall signal in the dynamical spin injection due to the pressure application is caused by the enhancement of the interfacial spin mixing conductance.