Asymmetric magnetization reversal in exchange biased polycrystalline F/AF bilayers

TL;DR

This paper presents a model explaining asymmetric magnetization reversal in exchange biased F/AF bilayers, fitting experimental hysteresis loop shapes by expanding exchange energy into cosine series and considering easy axis dispersion.

Contribution

It introduces a novel model that accurately describes hysteresis asymmetry in exchange biased bilayers using energy expansion and easy axis dispersion parameters.

Findings

Model fits experimental hysteresis loops for any field direction.

Hysteresis asymmetry explained through energy considerations.

Easy axis dispersion quantified by angle beta.

Abstract

This paper describes a model for magnetization reversal in polycrystalline Ferromagnetic/Antiferromagnetic exchange biased bilayers. We assume that the exchange energy can be expanded into cosine power series. We show that it is possible to fit experimental asymmetric shape of hysteresis loops in exchange biased bilayer for any direction of the applied field. The hysteresis asymmetry is discussed in terms of energy considerations. An angle beta is introduced to quantify the easy axis dispersion of AF grains.