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

TL;DR

This paper investigates how spin-dependent scattering in ferromagnetic metals can generate a perpendicular spin Hall effect, revealing a dominant extrinsic mechanism that can be tuned via alloy composition for spintronic applications.

Contribution

It demonstrates that spin-dependent scattering induces a perpendicular spin Hall effect in ferromagnets, highlighting a controllable extrinsic mechanism for spin current generation.

Findings

Spin-dependent scattering produces a high perpendicular spin current.

Superposition of spin-conserve and spin-flip channels causes spin currents.

Optimizing alloy composition can control the spin Hall effect.

Abstract

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.