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Many systems crackle, from earthquakes and financial market to Barkhauseneffect in ferromagnetic materials. Despite the diversity in essence, the noiseemitted in these dynamical systems consists of avalanche-like events with broadrange of sizes and durations, characterized by power-law avalanchedistributions and typical average avalanche shape that are signatures dependenton the universality class of the underlying dynamics. Here we focus on thecrackling noise in ferromagnets and scrutinize the traditional statistics ofBarkhausen avalanches in polycrystalline and amorphous ferromagnetic filmshaving different thicknesses. We show how scaling exponents and average shapeof the avalanches evolve with the structural character of the materials andfilm thickness. We find quantitative agreement between experiment andtheoretical predictions of models for the magnetic domain wall dynamics, andthen elucidate the universality classes of Barkhausen avalanches inferromagnetic films. Thereby, we observe for the first time the dimensionalcrossover in the domain wall dynamics, and the outcomes of the interplaybetween system dimensionality and range of interactions governing the domainwall dynamics on Barkhausen avalanches.

Playing with universality classes of Barkhausen avalanches