Dzyaloshinskii-Moriya domain walls in magnetic nanotubes

TL;DR

This paper analytically investigates how Dzyaloshinskii-Moriya interaction influences the static and dynamic behavior of domain walls in ferromagnetic nanotubes, revealing chirality effects and control mechanisms for potential data storage applications.

Contribution

It provides an analytical framework for understanding DMI effects on domain walls in curved nanotubes, highlighting novel chirality-dependent behaviors and control strategies.

Findings

DMI induces chiral twisting of domains and compact domain walls.

Domain wall velocity depends on chirality and DMI strength.

External magnetic fields can significantly enhance domain wall velocity.

Abstract

We present an analytic study of domain-wall statics and dynamics in ferromagnetic nanotubes with spin-orbit-induced Dzyaloshinskii-Moriya interaction (DMI). Even at the level of statics, dramatic effects arise from the interplay of space curvature and DMI: the domains become chirally twisted leading to more compact domain walls. The dynamics of these chiral structures exhibits several interesting features. Under weak applied currents, they propagate without distortion. The dynamical response is further enriched by the application of an external magnetic field: the domain wall velocity becomes chirality-dependent and can be significantly increased by varying the DMI. These characteristics allow for enhanced control of domain wall motion in nanotubes with DMI, increasing their potential as information carriers in future logic and storage devices.