Current-driven dynamics of coupled domain walls in a synthetic antiferromagnet

TL;DR

This paper develops a theory for the current-driven motion of coupled magnetic domain walls in synthetic antiferromagnets, showing that interlayer coupling enhances mobility and reduces pinning effects, with implications for spintronic devices.

Contribution

It introduces a theoretical model for coupled domain wall dynamics in double-layer systems with interlayer electron hopping, highlighting the impact on mobility and pinning.

Findings

Interlayer coupling drives domain wall motion effectively.

Pinning effects are reduced when walls are initially separated.

Lower threshold current density for metastable configurations.

Abstract

We develop the theory of magnetic domain wall motion in coupled double-layer systems where electrons can hop between the layers giving rise to an antiferromagnetic coupling. We demonstrate that the force from the interlayer coupling drives the walls and the effect of the extrinsic pinning is greatly reduced if the domain walls are initially separated. The threshold current density for metastable spin-aligned configurations is also much lower. We conclude that the interlayer coupling has a significant effect on domain wall mobility in double-layer systems.