Patent ID: 6858155

Claim:
A method of forming a ferrite material, comprising: mixing as main components, an iron component ranging from 55.5 to 58.0 mole percent calculated as Fe 2 O 3 , an amount of manganese component ranging from 38.0 to 41.0 mole percent calculated as MnO, and an amount of zinc component ranging from 3.3 to 4.7 mole percent calculated as ZnO; mixing with the main components minor components, an amount of calcium component ranging from 0.030 to 0.100 weight percent calculated as CaO, an amount of silicon component ranging from 0.015 to 0.040 weight percent calculated as SiO 2 , and an amount of niobium component ranging from 0.010 to 0.030 weight percent calculated as Nb 2 O 5 ; wherein the major components and minor components of the raw materials are pulverized to a particle size ranging from 0.9μ to 1.9μ; and heat treating the major components and the minor components to form the ferrite material.