Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 20, Pages 4705-4708Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.4705
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We investigate the scaling properties of the Barkhausen effect by recording the noise in several soft ferromagnetic materials: polycrystals with different grain sizes and amorphous alloys. We measure the Barkhausen avalanche distributions and determine the scaling exponents. In the limit of vanishing external field rate, we can group the samples in two distinct classes, characterized by exponents tau = 1.50 +/- 0.05 or tau = 1.27 +/- 0.03, for the avalanche size distributions. We interpret these results in terms of the depinning transition of domain walls and obtain an expression relating the cutoff of the distributions to the demagnetizing factor which is in quantitative agreement with experiments.
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