Dynamical Coupling Between Ferromagnets Due to Spin Transfer Torque

TL;DR

This paper demonstrates how electrical currents induce dynamical coupling between ferromagnetic layers via spin transfer torque, affecting their stability and magnetic reversal efficiency.

Contribution

It introduces a combined analytic and numerical approach to show how spin transfer torque causes dynamical coupling in magnetic bilayers, impacting their behavior.

Findings

Electrical current induces dynamical coupling between layers.

Coupling affects stability of magnetic regimes.

Impacts efficiency of magnetic reversal.

Abstract

We use a combination of analytic calculations and numerical simulations to demonstrate that electrical current flowing through a magnetic bilayer induces dynamical coupling between the layers. The coupling originates from the dependence of the spin transfer torque exerted on the layers on the relative orientations of their magnetic moments. We demonstrate that such coupling modifies the behaviors of both layers, significantly affecting the the stability of the current-induced dynamical regimes and the efficiency of current-induced magnetic reversal.