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arXiv · 0903.0795

Hysteresis in the T=0 RFIM: beyond metastable dynamics

F. Salvat-Pujol·E. Vives·M. L. Rosinberg
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Abstract

We present a numerical study of the zero-temperature response of the Gaussian random-field Ising model (RFIM) to a slowly varying external field, allowing the system to be trapped in microscopic configurations that are not fully metastable. This modification of the standard single-spin-flip dynamics results in an increase of dissipation (hysteresis) somewhat similar to that observed with a finite driving rate. We then study the distribution of avalanches along the hysteresis loop and perform a finite-size scaling analysis that shows good evidence that the critical exponents associated to the disorder-induced phase transition are not modified.

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F. Salvat-Pujol, E. Vives, M. L. Rosinberg. 2009-07-17. Hysteresis in the T=0 RFIM: beyond metastable dynamics. https://doi.org/10.1103/physreve.79.061116

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