Hysteresis loops of Co-Pt perpendicular magnetic multilayers

TL;DR

This paper presents a phenomenological stochastic cellular automata model that explains the magnetic hysteresis behavior of Co-Pt multilayers, matching experimental observations and providing insights into domain nucleation and loop features.

Contribution

The paper introduces a novel stochastic cellular automata model for magnetic hysteresis in Co-Pt multilayers, linking microscopic domain behavior to macroscopic hysteresis features.

Findings

Model reproduces sharp drops in hysteresis loops

Experimental verification of model predictions

Insights into domain nucleation processes

Abstract

We develop a phenomenological model to study magnetic hysteresis in two samples designed as possible perpendicular recording media. A stochastic cellular automata model captures cooperative behavior in the nucleation of magnetic domains. We show how this simple model turns broad hysteresis loops into loops with sharp drops like those observed in these samples, and explains their unusual features. We also present, and experimentally verify, predictions of this model, and suggest how insights from this model may apply more generally.