Dzyaloshinskii-Moriya domain walls in magnetic nanotubes

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.

7 pages, 7 figures

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• Curvature effects on phase transitions in chiral magnets
• Instantons in Chiral Magnets
• Walker solution for Dzyaloshinskii domain wall in ultrathin ferromagnetic films
• On the speed of domain walls in thin nanotubes: the transition from the linear to the magnonic regime
• Traveling domain walls in chiral ferromagnets
• Chiral breakdown engineered by mesoscale Dzyaloshinskii-Moriya interaction in biaxial magnetic nanotubes
• Domain wall dynamics for an in-plane magnetized thin film with large perpendicular hard axis anisotropy including Dzyaloshinskii-Moriya interaction
• Spin-orbit torque driven motion of chiral domain walls induced by radial magnetization in nanotube geometry
• Asymptotic stability of precessing domain walls for the Landau-Lifshitz-Gilbert equation in a nanowire with Dzyaloshinskii-Moriya interaction