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Title: Influence of the driving mechanism on the response of systems with athermal dynamics: The example of the random-field Ising model
Author: Illa i Tortós, Xavier
Rosinberg, Martin-Luc
Vives i Santa-Eulàlia, Eduard
Keywords: Histèresi
Model d'Ising
Mecànica estadística
Ising model
Statistical mechanics
Issue Date: 2006
Publisher: The American Physical Society
Abstract: We investigate the influence of the driving mechanism on the hysteretic response of systems with athermal dynamics. In the framework of local mean-field theory at finite temperature (but neglecting thermally activated processes), we compare the rate-independent hysteresis loops obtained in the random field Ising model when controlling either the external magnetic field H or the extensive magnetization M. Two distinct behaviors are observed, depending on disorder strength. At large disorder, the H-driven and M-driven protocols yield identical hysteresis loops in the thermodynamic limit. At low disorder, when the H-driven magnetization curve is discontinuous (due to the presence of a macroscopic avalanche), the M-driven loop is reentrant while the induced field exhibits strong intermittent fluctuations and is only weakly self-averaging. The relevance of these results to the experimental observations in ferromagnetic materials, shape memory alloys, and other disordered systems is discussed.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 2006, vol. 74, núm. 22, p. 224403-1-224403-10
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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