Magnetic domain walls in constrained geometries

TL;DR

This paper investigates how geometrical constrictions in micrometer-sized Fe20Ni80 elements influence magnetic domain walls, demonstrating control over wall width and type through constriction design using microscopy and simulations.

Contribution

It introduces a method to tailor magnetic domain wall width and type by modifying constriction geometries in micrometer-sized magnetic elements.

Findings

Constricted geometries can significantly alter domain wall width.

The type of domain wall can be modified by constriction design.

Numerical simulations support experimental observations.

Abstract

Magnetic domain walls have been studied in micrometer-sized Fe20Ni80 elements containing geometrical constrictions by spin-polarized scanning electron microscopy and numerical simulations. By controlling the constriction dimensions, the wall width can be tailored and the wall type modified. In particular, the width of a 180 degree Neel wall can be strongly reduced or increased by the constriction geometry compared with the wall in unconstrained systems.