| 摘要 |
PROBLEM TO BE SOLVED: To enable reducing magnetic loss by specifying the composition amount of Fe2O3, NiO, CuO and ZnO which are main component and SiO2 or MnO which are admixture to the main component. SOLUTION: As main component composition, 43-50 mol% of Fe2O3, 10-40 mol% of NiO, 1-15 mol% of CuO and residual ZnO are used, and at least one kind out of 0.005-0.1 wt.% of SiO2 and 0.005-0.5 wt.% of MnO is added as admixture, thereby obtaining low loss oxide magnetic material. The mean crystal grain diameter of a baked member is set at least 5 μm, and the ratio of pores in crystal grains to the whole pores is set as 5-60%, so that oxide magnetic material of lower loss can be obtained. Since resistivity is remarkably high, direct winding of a coil is enabled, and a jig for winding like a bobbin is unnecessary. Since the resistivity is high, collective baking with magnetic material is possible, and microminiaturization is enabled. |
