Abstract
The ac susceptibilities and domain structures of iron-based amorphous ribbons have been studied in as-quenched, zero-field annealed, and field annealed states. The eddy-current analysis indicates that the low-field susceptibility always has roughly equal contributions from domain-wall displacements and domain magnetization rotations. Anomalous fluctuations of susceptibility have been found which are attributed to a repeated spontaneous process of domain wall disaccommodation due to local directional ordering and small thermally activated reconstruction in domain structure.
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