Hitachi Metals, Ltd.

Takeshi Yanagihara

Tomoyuki Tada

Yasuharu Miyoshi

The invention provides a ferrite material (ferrite sintered body, ferrite powders) having a composition formula of (1-x-y-z)(LiFe)O.xZnO.y(Mn, Fe)O.zCuO, wherein x, y, z, and a satisfy 0.175&#x2266;x&#x2266;0.29; 0.475&#x2266;y&#x2266;0.51; 0.07&#x2266;z&#x2266;0.22; and 0.02&#x2266;a&#x2266;0.055 in a case of a=Mn/(Mn+Fe). At least one of Co oxide, Co hydroxide, and Co carbonate in an amount of 1 wt. % or less on the basis of CoO may be contained in 100 wt % of the ferrite material. The ferrite material has a normalized impedance Zof 40000 &#x3a9;/m or more at 30 MHz and a normalized impedance Zof 60000 &#x3a9;/m or more at 100 MHz as well as a specific resistance of 10&#x3a9;m or more.

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Shizuoka, Japan

Takeshi Yanagihara