Abstract
Grain-oriented 3% Si-Fe strips were plastically strained up to \epsilon = 3 %. The frequency spectrum E(f) of the Barkhausen noise was measured. From E(O) a mean Barkhausen volume v eff is calculated. The noise and v eff are diminished after plastic deformation mainly already in the region \epsilon %, where the coercive field remains still constant, v eff is related to a mean irreversible susceptibility, which is mainly determined by the hysteresis loop. By measurements of the correlation of the flux changes along the specimen a mean length of the Barkhausen volumes was obtained. Its diminution mainly causes the diminution of v eff . The connection of the results with changes of the domain and dislocation structure is discussed.
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