Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2009-11-12
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.
Bohn Felipe
Durin Gianfranco
Papanikolaou Stefanos
Sethna James P.
Sommer Rubem L.
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