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We report on a systematic comparative study of the spin Hall efficiencybetween highly face-centered cubic (fcc)-textured Pt-Al alloy films grown onMgO(001) and poorly-crystallized Pt-Al alloy films grown on SiO$_2$. UsingCoFeB as the detector, we show that for Al compositions centering around $x =25$, mainly L1$_{2}$ ordered Pt$_{100-x}$Al$_x$ alloy films grown on MgOexhibit outstanding charge-spin conversion efficiency. ForPt$_{78}$Al$_{22}$/CoFeB bilayer on MgO, we obtain damping-like spin Hallefficiency as high as $\xi_\textrm{DL} \sim +0.20$ and expect up to seven-foldreduction of power consumption compared to the polycrystalline bilayer of thesame Al composition on SiO$_2$. This work demonstrates that improving thecrystallinity of fcc Pt-based alloys is a crucial step for achieving large spinHall efficiency and low power consumption in this material class.

Highly fcc-textured Pt-Al alloy films grown on MgO(001) showing enhanced spin Hall efficiency