A giant Barkhausen effect with second-order instability

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Abstract
We have observed a giant Barkhausen effect where magnetization proceeds continuously with field in a second-order instability process. This is contrasted with the typical giant Barkhausen effect in which the magnetization jumps, or moves discontinuously with field in a first-order instability process. This second-order instability process has been found in Fe-rich amorphous wires in two cases: (i) transverse field-annealed long wires and (ii) short as-cast wires. Anomalous losses are found to be very large and are of significant magnitude around 1 Hz.