Patent ID: 6419847
Filing Date: 2002-07-16
Classification: C01G,C01P,C04B,H01F

Abstract:
A magnet powder with a ferrite primary phase represented as (1âˆ’x)SrO.(x/2)La2O3.(nâˆ’y/2)Fe2O3.yCoO,wherein x and y represent mole fractions, and wherein 0&lE;x&lE;0.4, 0.1&lE;y&lE;0.4 and 5.5&lE;n&lE;6.5, and wherein Fe has a magnetic moment oriented upwardly with respect to a crystal c-axis at a number of sites thereof, and also has an opposite magnetic moment oriented downwardly with respect to the crystal c-axis at another number of sites thereof, and wherein the number of sites oriented in one direction is greater than the number of sites oriented in the opposite direction and Co substitutes for Fe in sites which have a greater number, and wherein said magnet exhibits a magnetic anisotropy field HA of 1750 kA/m or more and saturation magnetization &sgr;s of 84.78 &mgr;Wbm/kg or more at room temperature.