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The soft magnetic properties of a nanocrystalline bcc Fe90Zr7B3 alloy with a Co substitution obtained by annealing a melt-spun amorphous phase were investigated. The addition of Co to the nanocrystalline Fe-Zr-B alloy causes an increase in permeability. This is presumed to be due to an increase in the exchange coupling between individual bcc grains resulting from an increase in the Curie temperature of the residual amorphous phase as well as a reduction of magnetostriction. The influence of the residual stress, which is caused by molding the samples in epoxy resin, on the magnetic core properties was examined for the nanocrystalline Fe-Co-Zr-B alloys. A low core loss of 66.6 W /kg at 100 kHz and 0.2 T was confirmed for a zero magnetostrictive (Fe0.985-Co0.015)90Zr7B3 sample with a saturation magnetization of 1.64 T under a residual stress of －1.4 × 108 Pa.
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Suzuki et al. (1994) studied this question.
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