Structure of magnetic domain wall in cylindrical microwire

TL;DR

This paper presents an analytical model for the structure of magnetic domain walls in cylindrical ferromagnetic microwires, incorporating internal stress effects and validated by micromagnetic simulations.

Contribution

It introduces a simple analytical model that accounts for internal stress-induced anisotropy in domain wall structures of microwires and extends applicability to nanowires with core-shell magnetic structures.

Findings

Classification of DW textures based on internal stress effects

Validation of the model through micromagnetic simulations

Application of the model to nanowires with constrictions

Abstract

The magnetization in the domain walls (DWs) formed inside the inner core of the amorphous ferromagnetic microwire is studied within a simple analytical model proposed. The influence of the ordering in the internal-stress created outer shell of the wire is included via an effective Dzyaloshinskii-Moriya-like anisotropy and resulting DW textures have been classified. The model is applicable to periodically constricted nanowires (whose core-shell magnetic structure follows from the magnetostatics) as well, which has enabled the verification of the predictions on DW structure with the micromagnetic simulations.