Spin rectification induced by dynamical Hanle effect

TL;DR

This paper investigates how a dynamical Hanle effect causes rectification of spin accumulation in a ferromagnetic/nonmagnetic bilayer under ferromagnetic resonance, revealing a new mechanism for spin current manipulation.

Contribution

It demonstrates that ac spin accumulation coupled with microwave magnetic fields via the dynamical Hanle effect can produce rectified spin signals comparable to dc spin accumulation from spin pumping.

Findings

Dynamical Hanle effect induces rectification of spin accumulation.

Rectified spin accumulation is comparable to dc spin accumulation.

Spin pumping generates both dc and ac spin accumulations.

Abstract

Dynamic response of spin accumulation to a time-dependent magnetic field has been investigated in a ferromagnetic/nonmagnetic bilayer under ferromagnetic resonance. In this system, magnetization precession driven by a microwave generates direct-current (dc) and alternate-current (ac) spin accumulation in the nonmagnetic layer by the spin pumping. The ac spin accumulation is coupled with the microwave magnetic field through a dynamical Hanle spin precession, giving rise to rectified spin accumulation comparable with the dc spin accumulation directly generated by the spin pumping.