Dipolar random field Ising model: an application to garnet films

TL;DR

This paper demonstrates that the dipolar-random field Ising model effectively describes the magnetization and hysteresis behavior of garnet films, highlighting the role of exchange and dipolar interactions without extensive parameter tuning.

Contribution

It applies the DRFIM to garnet films and shows its success in reproducing experimental hysteresis loops with minimal parameter adjustment.

Findings

DRFIM accurately models garnet film magnetization.

Hysteresis loops are well described by the model.

Interplay of exchange and dipolar interactions is key.

Abstract

The dipolar-random field Ising model (DRFIM) recently introduced displays a behaviour that can be connected to the magnetization of bidimensional magnetic media. Epitaxial magnetic garnet films seem to be the ideal test material for such a model. In this work the results of the measurements performed on garnet samples are presented, as well as the comparisons with simulation results obtained by the DRFIM. The results prove that a variety of hysteresis loops are well described by the DRFIM. This capability does not derive from the fine tuning of a great number of parameters, but by the interplay of exchange and dipolar interactions.