Magnetization distribution and domain wall dynamics in nanotube with surface anisotropy

TL;DR

This paper investigates how surface anisotropy affects magnetization oscillations and domain wall dynamics in nanotubes and nanowires, revealing that surface effects can significantly alter domain wall velocity and oscillation periods.

Contribution

It provides numerical analysis of surface anisotropy's impact on magnetization oscillations and domain wall motion, highlighting the hopping mode and velocity changes.

Findings

Surface anisotropy influences oscillation periods.

Hopping mode observed for domain wall movement.

Domain wall velocity decreases with surface anisotropy.

Abstract

The period of magnetization oscillations that occur near the surface of a nanotube or nanowire under the influence of surface magnetic anisotropy is determined by means of numerical simulation as a function of nanowire geometry and material parameters. The hopping mode is observed for stationary movement of a head-to-head domain wall along nanowire axis in applied magnetic field. The average speed of the domain wall in the hopping mode is found to be several times less than the stationary velocity of the wall in the absence of surface anisotropy.