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Crackling Noise, Power Spectra and Disorder Induced Critical Scaling

A. Travesset·R. A. White·K. A. Dahmen
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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.

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A. Travesset, R. A. White, K. A. Dahmen. 2001-12-14. Crackling Noise, Power Spectra and Disorder Induced Critical Scaling. https://doi.org/10.1103/physrevb.66.024430

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