Probing domain walls in cylindrical magnetic nanowires with electron holography

TL;DR

This paper uses electron holography to analyze magnetic domain walls in cylindrical nanowires, providing a new method for rapid identification of domain wall types and introducing an efficient computational algorithm.

Contribution

It presents a novel approach combining modeling and experimental electron holography to distinguish domain wall types in nanowires quickly and accurately.

Findings

Successful differentiation of domain wall types in NiCo nanowires

Development of a new algorithm for magnetic contrast calculation

Validation of modeling with experimental holography data

Abstract

We probe magnetic domain walls in cylindrical soft magnetic nanowires using electron holography. We detail the modelling of expected contrast for both transverse and Bloch point domain walls and provide comparison with experimental observations performed on NiCo nanowires, involving also both magnetic and electrostatic contribution to the electron holography map. This allows the fast determination of the domain wall type without the need for uneasy and time-consuming experimental removal of the electrostatic contribution. Finally, we describe and implement a new efficient algorithm for calculating the magnetic contrast.