| FeCoNbB Hitperms without and with some Si show pronounced secondary magnetic anisotropy of the hard-ribbon-axis type if the surfaces differ from the ribbon interior. Precursor amorphous ribbons could bear some initial heterogeneity and ultrasonic cleaning prior to annealing caused a modest reduction of the secondary anisotropy indeed. Longitudinal field annealed heterogeneous samples do not show the expected general reduction of the hard ribbon axis but partly the opposite. As this effect is more pronounced when the alloy shows easier viscous flow at elevated temperatures, a creep-induced-like anisotropy is considered to overwhelm the feeble field-induced anisotropy. The obvious magnetoelastic anisotropy familiar with positively magnetostrictive materials is present as well. |
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