Crackling Noise, Power Spectra and Disorder Induced Critical Scaling
Abstract
Crackling noise is observed in many disordered non-equilibrium systems in response to slowly changing external conditions. Examples range from Barkhausen noise in magnets to acoustic emission in martensites to earthquakes. Using the non-equilibrium random field Ising model, we derive universal scaling predictions for the dependence of the associated power spectra on the disorder and field sweep rate, near an underlying disorder-induced non-equilibrium critical point. Our theory applies to certain systems in which the crackling noise results from avalanche-like response to a (slowly) increasing external driving force, and is characterized by a broad power law scaling regime of the power spectra. We compute the critical exponents and discuss the relevance of the results to experiments.
Cite
@article{arxiv.cond-mat/0112133,
title = {Crackling Noise, Power Spectra and Disorder Induced Critical Scaling},
author = {A. Travesset and R. A. White and K. A. Dahmen},
journal= {arXiv preprint arXiv:cond-mat/0112133},
year = {2009}
}
Comments
27 Latex Pages, 14 eps figures