Fast domain wall propagation under an optimal field pulse in magnetic nanowires

TL;DR

This paper presents a novel method to significantly accelerate domain wall propagation in magnetic nanowires by applying an optimally designed, space-dependent magnetic field pulse synchronized with the domain wall motion, leading to enhanced speed and energy efficiency.

Contribution

The study introduces a new optimal field pulse strategy that dramatically increases domain wall velocity, surpassing traditional static field methods, with potential implications for magnetic device performance.

Findings

DW velocity can be increased by about two orders of magnitude.

Optimal field pulse synchronizes with DW propagation for maximum speed.

Energy release is proportional to DW velocity, indicating efficient energy utilization.

Abstract

We investigate field-driven domain wall (DW) propagation in magnetic nanowires in the framework of the Landau-Lifshitz-Gilbert equation. We propose a new strategy to speed up the DW motion in a uniaxial magnetic nanowire by using an optimal space-dependent field pulse synchronized with the DW propagation. Depending on the damping parameter, the DW velocity can be increased by about two orders of magnitude compared the standard case of a static uniform field. Moreover, under the optimal field pulse, the change in total magnetic energy in the nanowire is proportional to the DW velocity, implying that rapid energy release is essential for fast DW propagation.