The invention discloses a hexagonal sintered permanent magnetic
ferrite magnet and a preparation method thereof and belongs to the field of permanent magnetic ferrite magnets. The composition formula of the hexagonal sintered permanent magnetic
ferrite magnet is represented as A<2+>(1-x-y)B<1+>yLa<3+>xFe<3+>(n-z)Co<2+>zO<2->19, A is at least one of
divalent alkaline earth metal Ca, Sr and Ba, B is at least one of univalent
alkali metal Li, Na and K, x, y, z and n represent adding proportions of elements respectively, wherein x is 0.24-0.45, y is 0.03-0.10, z is 0.20-0.33, n is 10.0-12.0, x is larger than or equal to 1.1z and smaller than or equal to 1.8z, and the sum of y and z is smaller than or equal to x. The preparation method of the hexagonal sintered permanent magnetic
ferrite magnet comprises steps as follows: material mixing, pre-
sintering, coarse crushing, ball milling, forming,
sintering and the like. The
magnet has an M type magnetoplumbite structure basically and has higher
residual magnetization and higher intrinsic
coercivity / squareness ratio (Hk / Hcj) than a traditional permanent magnetic ferrite
magnet, and the magnetic performance is remarkably optimized.