Giant Enhancement of Intrinsic Spin Hall Conductivity in $\beta$ Tungsten via Substitutional Doping

Abstract

A key challenge in manipulating the magnetization in heavy-metal/ferromagnetic bilayers via the spin-orbit torque is to identify materials that exhibit an efficient charge-to-spin current conversion. Ab initio electronic structure calculations reveal that the intrinsic spin Hall conductivity (SHC) for pristine $\beta$-W is about sixty percent larger than that of $\alpha$-W. More importantly, we demonstrate that the SHC of $\beta$-W can be enhanced via Ta alloying. This is corroborated by spin Berry curvature calculations of W${}_{1-x}$Ta${}_x$ ($x$ $\sim$ 12.5%) alloys which show a giant enhancement of spin Hall angle of up to $\approx$ $-0.5$. The underlying mechanism is the synergistic behavior of the SHC and longitudinal conductivity with Fermi level position. These findings, not only pave the way for enhancing the intrinsic spin Hall effect in $\beta$-W, but also provide new guidelines to exploit substitutional alloying to tailor the spin Hall effect in various materials.

References in corpus (1)

• Absence of vertex correction for the spin Hall effect in p-type semiconductors

Cited by in corpus (19)

• Roadmap of spin-orbit torques
• Observation of long-range orbital transport and giant orbital torque
• Intrinsic Spin Hall Conductivity of MoTe2 and WTe2 Semimetals
• Unconventional spin Hall effects in nonmagnetic solids
• Acoustic spin Hall effect in strong spin-orbit metals
• Toward 100% Spin-Orbit Torque Efficiency with High Spin-Orbital Hall Conductivity Pt-Cr Alloys
• Symmetry Conserving Maximally Projected Wannier Functions
• Computation of intrinsic spin Hall conductivities from first principles using maximally-localized Wannier functions
• Enhancement of spin Hall conductivity in W-Ta alloy
• Energy-efficient W${}_{\text{100-x}}$Ta${}_{\text{x}}$/CoFeB/MgO spin Hall nano-oscillators
• Origin and Large Enhancement of Large Spin Hall Angle in Weyl Semimetals LaAl$X$ ($X$=Si, Ge)
• Negative orbital Hall effect in Germanium
• Ultra-low Power Domain Wall Device for Spin-based Neuromorphic Computing
• Functionalized Tellurene; a candidate large-gap 2D Topological Insulator
• Current-induced spin polarization at metallic surfaces from first-principles
• Emergent spin Hall conductivity in Tantalum-Rhenium alloys
• Dependence of the Inverse Spin Hall Effect in Sr(Nb${}_x$Ti${}_{1-x}$)O${}_3$ on the Nb concentration
• Doping-induced spin Hall ratio enhancement in A15-phase, Ta-doped Beta-W thin films
• Generating unconventional spin-orbit torques with patterned phase gradients in tungsten thin films