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Spin-orbit torque manifested as an accumulated spin-polarized moment atnonmagnetic normal metal, and ferromagnet interfaces is a promisingmagnetization switching mechanism for spintronic devices. To fully exploit thisin practice, materials with a high spin Hall angle, i.e., a charge-to-spinconversion efficiency, are indispensable. To date, very few approaches havebeen made to devise new nonmagnetic metal alloys. Moreover, new materials needto be compatible with semiconductor processing. Here we introduce W-Ta and W-Valloys and deploy them at the interface between $\beta$-W/CoFeB layers. First,spin Hall conductivities of W-Ta and W-V structures with various compositionsare carried out by first-principles band calculations, which predict the spinHall conductivity of the W-V alloy is improved from $-0.82 \times 10^3$ S/cmthat of W to $-1.98 \times 10^3$ S/cm. Subsequently, heterostructurefabrication and spin-orbit torque properties are characterized experimentally.By alloying $\beta$-W with V at a concentration of 20 at%, we observe a largeenhancement of the absolute value of spin Hall conductivity of up to $-(2.77\pm 0.31) \times 10^3$ S/cm. By employing X-ray diffraction and scanningtransmission electron microscopy, we further explain the enhancement ofspin-orbit torque efficiency is stemmed from W-V alloy between W and CoFeB.

Spin-Orbit Torque Engineering in \beta-W/CoFeB Heterostructures via Ta and V Alloying at Interfaces