Beyond power laws: Universality in the average avalanche shape

Details Beyond power laws: Universality in the average avalanche shape Beyond power laws: Universality in the average avalanche shape

2009-11-12

arxiv.org/abs/0911.2291v2

Nature Physics 7, 316--320 (2011)

Physics

Condensed Matter

Disordered Systems and Neural Networks

13 pages, 14 figures

Scientific paper

10.1038/nphys1884

We report the measurement of multivariable scaling functions for the temporal average shape of Barkhausen noise avalanches, and show that they are consistent with the predictions of simple mean-field theories. We bypass the confounding factors of time-retarded interactions (eddy currents) by measuring thin permal- loy films, and bypass thresholding effects and amplifier distortions by applying Wiener deconvolution. We find experimental shapes that are approximately symmetric, and track the evolution of the scaling function. We solve a mean- field theory for the magnetization dynamics and calculate the form of the scaling function in the presence of a demagnetizing field and a finite field ramp-rate, yielding quantitative agreement with the experiment.

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