CALCINED FERRITE, AND SINTERED FERRITE MAGNET AND ITS PRODUCTION METHOD

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A sintered ferrite magnet has a composition of metal elements Ca, R, A, Fe, and Co represented by the general formula Ca1-x-yRxAyFe2n-zCoz, wherein R is at least one of rare earth elements and inevitably includes La; A is Sr and/or Ba; x, y, z and n represent the atomic ratio of Ca, R, A, Fe and Co; 2n represents a molar ratio represented by 2n = (Fe + Co)/(Ca + R + A); and x, y, z, and n satisfy the following conditions : 0.15 y, 0 < z < = 0.18, and 7.5 < = (2n-z) < 11.0.