FERRITE SINTERED MAGNET PRODUCING METHOD AND FERRITE SINTERED MAGNET

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A sintered ferrite magnet comprising (a) a ferrite phase having a hexagonal M-type magnetoplumbite structure comprising Ca, an element R which is at least one of rare earth elements and indispensably includes La, an element A which is Ba and/or Sr, Fe, and Co as indispensable elements, the composition of metal elements of Ca, R, A, Fe and Co being represented by the general formula of Ca1-x-yRxAyFe2n-zCoz, wherein the atomic ratios (1-x-y), x, y and z of these elements and the molar ratio n meet the relations of 0.3 ≤ (1-x-y) ≤ 0.65 , 0.2 ≤ x ≤ 0.65, 0 ≤ y ≤ 0.2, 0.03 ≤ z ≤ 0.65, and 4 ≤ n ≤ 7, and (b) a grain boundary phase indispensably containing Si, the amount of Si being more than 1% by mass and 1.8% or less by mass (calculated as SiO2) based on the entire sintered ferrite magnet, and its production method.