Highly Efficient Spin-Current Generation by the Spin Hall Effect in Au1−xPtx
Current-induced spin-orbit torques (SOTs) in heavy-metal/ferromagnet systems are promising for efficiently manipulating magnetization in nanoscale spintronics, but the energy efficiency of SOT operations remains limited by a combination of material parameters. The authors report very efficient generation of spin current via the spin Hall effect in Au-Pt alloy, which combines a giant internal spin Hall ratio with a relatively low resistivity. This work establishes Au${}_{0.25}$Pt${}_{0.75}$ as a milestone spin-current generator, more energy-efficient than other heavy metals or topological insulators, to benefit the development of fast, efficient SOT-driven magnetic memory and other devices.