Enhanced Domain Wall Motion in the Spin Valve Nanowires

TL;DR

This paper introduces a new torque model based on interlayer exchange interaction that can significantly enhance or suppress domain wall velocity in spin valve nanowires, explaining recent experimental observations.

Contribution

It proposes an additional torque mechanism from interlayer exchange interaction that explains enhanced domain wall motion in spin valve nanowires.

Findings

Enhanced domain wall velocity observed experimentally.

The torque model predicts velocity modulation depending on exchange interaction sign.

Potential for controlling domain wall motion via interlayer exchange.

Abstract

According to the recent experiment by the Fert group, the velocity of domain wall motion in the spin valve ferromagnetic nanowires was almost doubly enhanced compared to the old value. In this work, we propose an additional torque model, arising from the interlayer exchange interaction, which can enhance or suppress the domain wall velocity depending on the sign of the exchange constant or the wall motion direction relative to the magnetization orientation of the fixed layer.