Temperature dependence of coercive force and anisotropy of the Sm(CoFeCuMn)7 permanent magnet

Demagnetization curves of Sm(CoFeCuMn)7 with applied fields up to 127 kOe both parallel and perpendicular to the c axis were measured at several temperatures from 4.2 K to 600 K. The ratio of IHc(400 K)/IHc(300 K) was found to be 0.83 which is a factor of two larger than that of Sm2(CoFeMnCr)17. The anisotropy constant was also determined in the temperature range from 4.2 to 480 K. The relationship between IHc(T) and K1(T) was discussed.