The statistical properties of Barkhausen noise in an epitaxial Fe film grown on MgO have been characterized with magneto-optical Kerr effect measurements. The data reveal that magnetization reversal takes place via sudden jumps between a discrete number of randomly distributed magnetic configurations. The smallest jumps occur on a scale length of 10μm and their amplitude distribution can be fitted with a power law: P(ΔM)0ex0ex=0ex0exΔM^-α with α0ex0ex=0ex0ex1.1 and ΔM spanning over several decades.
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E. Puppin (2000) studied this question.
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