Effect of Nonlocal Spin-Transfer Torque on Current-Induced Magnetization Dynamics

TL;DR

This paper investigates how nonlocal spin-transfer torque influences the dynamics of current-induced magnetization in nanomagnets, revealing that nonlocal effects enhance coherence and narrow spectral linewidths.

Contribution

It introduces a self-consistent model demonstrating the significant impact of nonlocal spin-transfer effects on magnetization dynamics, highlighting their importance for future experimental designs.

Findings

Nonlocal spin-transfer effects improve the coherence time of magnetization precession.

Nonlocal effects reduce the linewidth of the power spectrum.

Nonlocal spin torque causes nonlinear damping of spin-waves.

Abstract

Using the self-consistent model, we present nonlocal spin-transfer effects caused by the feedback between inhomogeneous magnetization and spin-transfer torque on the current-induced magnetization dynamics in nanomagnets. The nonlocal effects can substantially improve the coherence time of precession in nanomagnets and thus reduce the linewidth of power spectrum. This narrow linewidth results from the nonlinear damping of spin-waves due to the nonlocal spin torque which is inherent and thus should be considered in future experiments.