Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/10537
 Title: Metastable random-field Ising model with exchange enhancement: A simple model for exchange bias Author: Illa i Tortós, XavierVives i Santa-Eulàlia, EduardPlanes Vila, Antoni Keywords: HistèresiModel d'IsingVidres de spinHysteresisIsing modelSpin glasses Issue Date: 2002 Publisher: The American Physical Society 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. Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.66.224422 It is part of: Physical Review B, 2002, vol. 66, núm. 22, p. 224422-1-224422-7 URI: http://hdl.handle.net/2445/10537 Related resource: http://dx.doi.org/10.1103/PhysRevB.66.224422 ISSN: 0163-1829 Appears in Collections: Articles publicats en revistes (Física Quàntica i Astrofísica)

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