Magnetostatic bias in multilayer microwires: theory and experiments

TL;DR

This paper investigates how magnetostatic interactions in multilayer microwires cause a bias in hysteresis behavior, combining experimental results with an analytical model to understand the effect based on wire geometry.

Contribution

It provides a theoretical and experimental analysis of magnetostatic bias in multilayer microwires, highlighting the role of geometry and interlayer interactions.

Findings

Magnetostatic interaction induces antiferromagnetic-like coupling.

Hysteresis bias depends on microwire geometry.

Analytical model explains experimental observations.

Abstract

The hysteresis curves of multilayer microwires consisting of a soft magnetic nucleus, intermediate non-magnetic layers, and an external hard magnetic layer are investigated. The magnetostatic interaction between magnetic layers is proved to give rise to an antiferromagnetic-like coupling resulting in a magnetostatic bias in the hysteresis curves of the soft nucleus. This magnetostatic biasing effect is investigated in terms of the microwire geometry. The experimental results are interpreted considering an analytical model taking into account the magnetostatic interaction between the magnetic layers.