Efficient stopping of current-driven domain wall using a local Rashba field

TL;DR

This paper demonstrates theoretically that a localized Rashba interaction can effectively pin and depin current-driven domain walls with weak Rashba fields, enabling reliable control in racetrack memory devices.

Contribution

It introduces the concept of using a local Rashba interaction as a strong pinning center for domain walls, a novel approach for domain wall manipulation.

Findings

Weak Rashba interaction (~0.01 eVÅ) can pin domain walls effectively.

Local Rashba interaction acts as a strong pinning center.

Potential application in reliable racetrack memory control.

Abstract

We theoretically show that a locally-embedded Rashba interaction acts as a strong pinning center for current-driven domain walls and demonstrate efficient capturing and depinning of the wall using a weak Rashba interaction of the order of 0.01 eV{\AA}. Our discovery is expected to be useful for the highly reliable control of domain walls in racetrack memories.