Enhancing z Spin Generation in Trivial Spin Hall Materials for Scalable, Energy‐Efficient, Field‐Free, Complete Spin‐Orbit Torque Switching Applications

Abstract Despite the remarkable efforts in the past two decades, it has remained a major challenge to achieve switching of perpendicularly magnetized spin‐orbit torque devices in a scalable, energy‐efficient, field‐free, integration‐friendly, and complete manner. Here, a giant enhancement of z spin generation in low‐resistivity spin Hall metal/FeCoB devices is reported by alloying the spin Hall metal Pt with Ti and by electric asymmetry engineering. The damping‐like spin torques of z spins and y spins are enhanced by 6 and 3 times relative to those of conventional Pt/FeCoB and enable complete, record‐low‐power, deterministic switching of FeCoB devices with strong perpendicular magnetic anisotropy and high coercivity. The Pt 75 Ti 25 /FeCoB heterostructure also exhibits relatively low resistivity, wafer‐scale uniform sputterdeposition on silicon oxide, good compatibility with magnetic tunnel junctions, and excellent thermal stability of exceeding 400 °C. These results unambiguously establish the Pt 75 Ti 25 /FeCoB as the most compelling candidate for solving the bottleneck of scalable, energy‐efficient, field‐free, integration‐friendly, and complete spin‐orbit torque switching technologies. This work also provides a universal strategy for developing high‐performance generators of z ‐spin current and will stimulate the exploration of exotic spin currents by alloying “trivial” spin Hall materials.