Bulk metal magnetic component

Highly efficient bulk magnetism component parts contain two or more crystalline ferromagnetism metal belt board layers which adhesion combination is carried out and form a polyhedron form part in one. When it is made to magnetize to the peak guidance level B on magnetization frequency "f", magnetic component parts show a core loss smaller than the following "L. "L is given by formula L=0.0135f (B) +0.000108f (B), and the units of the above-mentioned core loss, the above-mentioned magnetization frequency, and the above-mentioned peak guidance level are kilogram, a hertz, and a tesla the whole watt, respectively. The performance characteristic of the highly efficient bulk magnetism component parts of the present invention is fairly good compared with the silicon steel component parts operated by the same frequency range.