Magnetic properties of Fe-Cu-Nb-X-B (X: Si, Ge, C, Ga) and Fe-Cu-Nb-Si-B-X (X: Ge, C, P, Ga, Al) nanocrystalline alloys were studied to improve soft magnetic properties and they were evaluated for some applications. Si was the best element for Fe-Cu-Nb-X-B system. Substitution of P for B made coercive force small in Fe-Cu-Nb-Si-B-X system having high saturation flux density. The cores using the Fe-based nanocrystalline alloys showed low core loss, excellent DC superimposed characteristic and good noise attenuation characteristics. Hence, Fe-based nanocrystalline alloys have high performance for magnetic components such as transformers and choke coils.
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