Reversal process of a magnetic vortex core under the combined action of a perpendicular field and spin transfer torque

TL;DR

This paper investigates how combined perpendicular magnetic fields and spin transfer torque influence vortex core reversal in nanopillars, revealing different switching mechanisms and potential applications in vortex-based non-volatile memory devices.

Contribution

It provides experimental and simulation insights into vortex core reversal mechanisms under combined magnetic and spin torque influences, introducing a current-controlled selective switching method.

Findings

Identification of static and dynamic vortex core reversal mechanisms

Dependence of reversal process on current values

Potential for current-controlled vortex memory applications

Abstract

In a nanopillar with dipolarly coupled vortices, we present an experimental and simulation study to understand how the interplay between the bias field and spin transfer torque impacts reversal of the vortex cores. We find that, depending on the current values, vortex cores might experience different physical mechanisms for their reversal, namely a static or a dynamic switching. We believe that our results might be useful in the context of vortex based non volatile memories, as a current controlled selective core switching is proposed.