The magnetoimpedance (GMI) profiles were measured in Fe84Zr7B8Cu1 amorphous ribbons annealed at various temperatures. The anisotropy field evaluated from GMI profiles changed sensitively with annealing temperature. The decreasing Hk and increasing magnitude of GMI with the annealing temperature were ascribed for by the increase of magnetic softness, while the increasing Hk and decreasing magnitude of GMI for the further increment of annealing temperature was associated with the microstructural change due to the annealing.
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Yoon et al. (1999) studied this question.
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