Non-reciprocity and exchange-spring delay of domain-wall Walker breakdown in magnetic nanowires with azimuthal magnetization

TL;DR

This paper investigates how the topology of magnetization and curvature effects in 3D nanomagnetic systems with vortex domains can intrinsically delay Walker breakdown in domain wall motion, with non-reciprocal behavior influenced by chirality.

Contribution

It introduces a novel understanding of how magnetization topology and curvature induce non-reciprocal delays in Walker breakdown in azimuthal magnetized nanowires.

Findings

Topology of magnetization distribution delays Walker breakdown.

Curvature induces non-reciprocal effects on Walker breakdown.

Chirality influences the delay depending on the direction of domain wall motion.

Abstract

Domain wall (DW) motion is a crucial process involved in magnetization reversal, be it under magnetic field or spin-polarized current stimulus. In most cases DW speed does not exceed $\approx$100m/s and collapses above a given threshold of the stimulus, an effect known as Walker breakdown. A few specific material properties have been identified to delay the breakdown of speed by increasing the energy barrier preventing internal precession. We show that in a 3D nanomagnetic system, here with vortex-state domains, the topology of the magnetization distribution may intrinsically and robustly delay the Walker breakdown due to an exchange-spring effect. In addition, curvature induces a major non-reciprocal effect, delaying or not the Walker breakdown depending on the chirality of the azimuthal domain versus the direction of motion of the DW.