UNIAXIAL MAGNETIC-ANISOTROPY IN FE-RICH 217 COMPOUNDS WITH SP SUBSTITUTIONS

The magnetic properties of single-phase 2:17 compounds of the composit ion Sm(2)Fe(17-x-y)Co(y)M(x) with M=Al and Ga and x and y in the range 0-5 are reported. The Curie temperature is found to increase for the y=0 samples with increasing x up to a maximum at x=3 for M=Al and x=4 for M=Ga and a monotonic increase with increasing y for all x and M. S amples with x<2 showed an easy-plane magnetic anisotropy at room tempe rature while samples with x>2 showed a single-phase uniaxial anisotrop y. The addition of Co is seen to increase the saturation magnetization and the anisotropy field.