Patent ID: 7169319

Claim:
A method for producing an anisotropic, sintered ferrite magnet having a basic composition represented by the following general formula: (A 1−x R x )O.n[(Fe 1−y M y ) 2 O 3 ] by atomic ratio, wherein A is Sr or (Sr+Ba), R is at least one rare earth element including Y, the M element is Co, and x, y and n are numbers meeting the following conditions: 0.01≦x≦0.4, 0.005≦y≦0.04, and 5≦n≦6, said anisotropic, sintered ferrite magnet having a magnetoplumbite crystal structure, and a magnetization-temperature curve of said anisotropic, sintered ferrite magnet having a concavely curved portion relative to a tangent on said magnetization-temperature curve when said tangent is drawn on said magnetization-temperature curve in the direction of the axis of abscissas(magnetization=0), said method comprising the steps of adding a compound of the R element and/or the M element at a step of uniformly mixing a compound of Sror (Sr+Ba) with an iron compound; calcining the resultant mixture; adding the remaining amount of said compound of the R element and/or the M element to the resultant calcined powder at a pulverization step thereof to form a finely pulverized powder; molding the resultant finely pulverized powder in a magnetic field; and sintering the resultant green body, wherein R is added as a hydroxide or R, and wherein said finely pulverized powder is finely pulverized in a wet state and an average diameter of said finely pulverized powder is 0.7–0.9 μm.