Perpendicularly Polarized Spin Hall Effects Induced by Spin-Dependent Scattering in Ferromagnetic Metals

Spin currents in ferromagnets afford diverse functionalities. We evaluate the extrinsic spin Hall effects of magnetic impurity scattering in ferromagnetic metals. We show that spin-dependent scattering can provide a high spin current polarized perpendicularly to the magnetization direction and is a dominant mechanism in the moderate-conductivity regime. We find that the superposition of the spin-conserve and spin-flip channels causes the spin currents. These findings suggest that optimizing alloy composition is an effective strategy to control the spin Hall effect.

Automated summary

Spin currents in ferromagnets have various functionalities. The extrinsic spin Hall effects of magnetic impurity scattering in ferromagnetic metals are evaluated. It is shown that spin-dependent scattering can generate a highly spin-polarized current perpendicular to the magnetization direction, and this mechanism dominates in the moderate-conductivity regime. The superposition of spin-conserving and spin-flip channels causes the spin currents. These findings suggest that optimizing alloy composition is an effective strategy for controlling the spin Hall effect.