Signal propagation in time-dependent spin transport

TL;DR

This paper theoretically investigates how time-dependent spin transport in magnetic multilayers exhibits wave-like behavior, enabling the determination of a finite spin signal-propagation velocity through a macroscopic Boltzmann equation approach.

Contribution

It introduces a macroscopic model showing wave-like spin transport dynamics and identifies a finite propagation velocity, advancing understanding of dynamic spin phenomena.

Findings

Time-dependent spin transport exhibits wave-like behavior.

A finite spin signal-propagation velocity can be extracted.

Modifications to pure spin-diffusion dynamics are demonstrated.

Abstract

This paper analyzes theoretically the signal propagation in spin transport by modulating the current passing through magnetic multilayers. Using a macroscopic description of spin transport based on the dynamical Boltzmann equation, we show that time-dependent spin transport possesses a wave-like character that leads to modifications of pure spin-diffusion dynamics. In particular, the wave-like characteristics allow one to extract a finite spin signal-propagation velocity.