Título:
|
Metastable random-field Ising model with exchange enhancement: A simple model for exchange bias
|
Autor/a:
|
Illa i Tortós, Xavier; Vives i Santa-Eulàlia, Eduard; Planes Vila, Antoni
|
Otros autores:
|
Universitat de Barcelona |
Abstract:
|
We present a simple model that allows hysteresis loops with exchange bias to be reproduced. The model is a modification of the $T=0$ random-field Ising model driven by an external field and with synchronous local relaxation dynamics. The main novelty of the model is that a certain fraction f of the exchange constants between neighboring spins is enhanced to a very large value ${J}_{E}.$ The model allows the dependence of the exchange bias and other properties of the hysteresis loops to be analyzed as a function of the parameters of the model: the fraction f of enhanced bonds, the amount of the enhancement ${J}_{E},$ and the amount of disorder, which is controlled by the width $\ensuremath{\sigma}$ of the Gaussian distribution of the random fields. |
Materia(s):
|
-Histèresi -Model d'Ising -Vidres de spin -Hysteresis -Ising model -Spin glasses |
Derechos:
|
(c) The American Physical Society, 2002
|
Tipo de documento:
|
Artículo Artículo - Versión publicada |
Editor:
|
The American Physical Society
|
Compartir:
|
|