Large exchange-dominated domain wall velocities in antiferromagnetically coupled nanowires

TL;DR

This paper demonstrates that antiferromagnetically coupled nanowires can achieve significantly higher domain wall velocities by overcoming Walker breakdown, enabling faster magnetic domain manipulation for data storage and processing.

Contribution

The study introduces a novel approach using antiferromagnetically coupled nanowires to extend or eliminate Walker breakdown, resulting in unprecedented domain wall velocities.

Findings

Walker breakdown can be extended or eliminated in coupled nanowires

Giant domain-wall velocities are achievable via field and current

Potential for faster magnetic data storage and processing

Abstract

Magnetic nanowires supporting field- and current-driven domain wall motion are envisioned for new methods of information storage and processing. A major obstacle for their practical use is the domainwall velocity, which is traditionally limited due to the Walker breakdown occurring when the forcing field or current reaches a critical threshold value. We show through numerical and analytical modeling that the Walker breakdown limit can be extended or completely eliminated in antiferromagnetically coupled magnetic nanowires. These coupled nanowires allow for giant domain-wall velocities driven by field and/or current via spin transfer torque as compared to conventional nanowires.