Dynamic Feedback in Ferromagnet/Spin Hall Metal Heterostructures

TL;DR

This paper investigates the dynamic feedback effects in ferromagnet/spin Hall metal heterostructures, revealing nonlinear damping and frequency-dependent magnetoimpedance that influence spin Hall oscillators and magnetoresistance.

Contribution

It introduces a comprehensive model solving spin diffusion with the spin Hall effect, uncovering new dynamic feedback phenomena in these heterostructures.

Findings

Nonlinear magnetic damping enables steady-state oscillations at large angles.

Frequency-dependent spin Hall magnetoimpedance affects device performance.

Dynamic feedback links energy dissipation in magnetization and current channels.

Abstract

In ferromagnet/normal metal heterostructures, spin pumping and spin-transfer torques are two reciprocal processes that occur concomitantly. Their interplay introduces a dynamic feedback effect interconnecting energy dissipation channels of both magnetization and current. By solving the spin diffusion process in the presence of the spin Hall effect in the normal metal, we show that the dynamic feedback gives rise to: (i) a nonlinear magnetic damping that is crucial to sustain uniform steady-state oscillations of a spin Hall oscillator at large angles. (ii) a frequency dependent spin Hall magnetoimpedance that reduces to the spin Hall magnetoresistance in the dc limit.