| abstract |
The present invention relates to a ferrite manufacturing technology for effectively removing the radioactive noise generated in the 500MHz to several GHz band, characterized in that the ultra-permeability of the ferrite magnetic material is lowered when increasing the content of Fe 2 O 3 and ZnO Bi 2 O 3 , SiO 2 , Co 3 O 4 , MnCO 3 , MgO containing 47 to 55 mol% of Fe 2 O 3 , 2 to 5 mol% of NiO, 3 to 10 mol% of CuO, and 37 to 45 mol% of ZnO. , BaO is to be made of a composition containing at least two or more additives within 3 mol%. |