We have studied the influence of surface fields H{sub}p (generated by either direct or alternating core current) on soft magnetic properties of amorphous and nanocrystalline Fe{sub}73.5Cu{sub}1Nb{sub}3Si{sub}15.5B{sub}7 ribbon. While in an amorphous ribbon the coercive field H{sub}c decreases with H{sub}p, in the same optimally annealed ribbon (H{sub}c = 1.3 A/m, M{sub}m ≈ M{sub}s) H{sub}c increases with H{sub}p for all the explored types of H{sub}p (static and dynamic with different phases with respect to that of the magnetizing field H). The unexpected increase of H{sub}c in nanocrystalline ribbon is associated with the influence of H{sub}p on the surface and main (inner) domain structure. Here, we develop a model that takes into account this influence and explains the experimental results.
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