OXIDE BASED MAGNETIC MATERIAL, PROCESS FOR PRODUCING THE SAME, SINTERED FERRITE MAGNET AND PROCESS

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A sintered ferrite magnet with M-type ferrite structure, containing, as indispensable constituent elements, Ca, element R being at least one rare earth element wherein La is indispensable, Ba, Fe and Co, and represented by the formula Ca1-x-yRxBayFe2n-zCoz {wherein (1-x-y), x, y, z and n respectively represent Ca, element R, Ba and Co contents and molar ratio, and the relations 0.2≤x≤0.65, 0.001≤y≤0.2, 0.03≤z≤0.65 and 4≤n≤7 are satisfied}.