Beneficial effect of Gd substitution on magnetic properties of magnetically anisotropic SmCo5 ribbons

Magnetically anisotropic Sm1−xGdxCo5 (x=0, 0.2, 0.5) ribbons are produced by conventional melt spinning. The coercivity Hc increases from 5 kOe for x=0 to 11 kOe for x=0.5. Microstructure analyses show that this abnormal change of the coercivity is ascribed to the decrease of the quantity of the 2:7 phase, which serves as a center for a reverse domain. The remanence ratio also increases from 0.80 for x=0 to 0.95 for x=0.5. An energy product of...