Topologically Protected Dynamics of Spin Textures

TL;DR

This paper investigates the universal dynamics of topological spin textures in magnetic nanowires, deriving effective equations of motion, analyzing domain wall structures, and proposing energy-efficient memory device strategies.

Contribution

It introduces a universal theoretical framework for topological spin texture dynamics and explores their manipulation for energy-efficient magnetic memory applications.

Findings

Derived effective equations for topological spin texture dynamics.

Identified optimal resonant current pulses for domain wall motion.

Proposed methods to measure and control domain wall behavior.

Abstract

We study current-induced dynamics of spin textures in thin magnetic nanowires. We derive effective equations of motion describing the dynamics of the domain-wall soft modes associated with topological defects. Because the magnetic domain walls are topological objects, these equations are universal and depend only on a few parameters. We obtain spin spiral domain-wall structure in ferromagnetic wires with Dzyaloshinskii-Moriya interaction and critical current dependence on this interaction. We also find the most efficient way to move the domain walls by resonant current pulses and propose a procedure to determine their dynamics by measuring the voltage induced by a moving domain wall. Based on translationally non-invariant nanowires, we show how to make prospective magnetic memory nanodevices much more energy efficient.