Abstract
The magnetization process in nanocrystalline Fe 73Cu 1Nb 3Si 16B 7 ribbons with different magnitudes of a magnetic field induced transverse anisotropy was investigated by Kerr-microscopy and magnetic hysteresis measurements at room temperature and elevated temperatures. Comparing samples with strong ( K u ≈ 30 J/m 3) and weak ( K u ≈ 3 J/m 3) induced anisotropy K u, we find significant differences in the magnetic microstructure, reflecting the interplay of the uniform, field induced and the random magneto-crystalline anisotropy. In particular for weak K u, we find irregular magnetization patches within the wide regular domains connected to the induced anisotropy. These magnetization patches are fluctuating on the scale of a few micrometers and are interpreted in terms of the random anisotropy.
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