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Hysteresis and avalanches in the T=0 random field ising model with 2-spin flip dynamics
Vives i Santa-Eulàlia, Eduard; Rosinberg, Martin-Luc; Tarjus, Gilles
Universitat de Barcelona
We study the nonequilibrium behavior of the three-dimensional Gaussian random-field Ising model at T=0 in the presence of a uniform external field using a two-spin-flip dynamics. The deterministic, history-dependent evolution of the system is compared with the one obtained with the standard one-spin-flip dynamics used in previous studies of the model. The change in the dynamics yields a significant suppression of coercivity, but the distribution of avalanches (in number and size) stays remarkably similar, except for the largest ones that are responsible for the jump in the saturation magnetization curve at low disorder in the thermodynamic limit. By performing a finite-size scaling study, we find strong evidence that the change in the dynamics does not modify the universality class of the disorder-induced phase transition.
04-05-2010
Histèresi
Fenòmens crítics (Física)
Model d'Ising
Hysteresis
Critical phenomena (Physics)
Ising model
(c) The American Physical Society, 2005
Artículo
The American Physical Society
         

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