Based on the first-principles calculation on the β-W based alloy structure using Ta and V, we have introduced the W–Ta and W–V alloy in between the β-W/CoFeB layer. Through the harmonic response method, we confirmed that experimentally obtained spin-Hall conductivity has fairly similar alloy compositional dependence with the theoretically calculated one. Particularly, when W80V20 alloy was placed at the β-W/CoFeB layer, the spin Hall conductivity reached (−2.77 ± 0.31) × 103 S/cm, which enhanced over 36% compared to the pristine β-W/CoFeB/MgO heterostructure.
- Gyu Won Kim
- Do Duc Cuong
- Young Keun Kim
