Abstract
With the aim of developing good soft magnetic materials, we examined the magnetic properties of nanocrystalline FeMB alloys containing various additional elements. The nanoscale bcc FeZrNbBCu alloys exhibited excellent soft magnetic characteristics of 1.5 to 1.6 T for saturation magnetization (B s), 1 to 2 A/m for coercive force (H c), 10×10 4 to 12×10 4 for permeability (μ e) at 1 kHz and nearly zero saturated magnetostriction (λ s) which had not been achieved for soft magnetic materials reported up to date. The excellent soft magnetic characteristics have already enabled the practical use as pulse transformers for portable telephones which require high μ e above 10 5 at 1 kHz and high B s above 1.5 T. The application fields are hereafter expected to increase significantly because of the excellent soft magnetic properties which have been obtained only for the present materials.
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