Metastable random-field Ising model with exchange enhancement: A simple model for exchange bias
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...
| Autores: | , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2002 |
| País: | España |
| Recursos: | Universidad de Barcelona |
| Repositório: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/10537 |
| Acesso em linha: | https://hdl.handle.net/2445/10537 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Histèresi Model d'Ising Vidres de spin Hysteresis Ising model Spin glasses |
| Resumo: | 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. |
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