SATURATION MAGNETIZATION AND ANISOTROPY FIELDS IN THE SM(CO1-XCUX)5 PHASES

The magnetic characteristics of high-anisotropy Sm(Co1-xCux)5 phases a re determined experimentally at 300 K in the range x<0.6. The saturati on magnetization M(s) decreases and vanishes for SmCo2Cu3. Identical b ehaviors of M(s) and Curie temperature T(C) versus x are observed in t he range x<0.6. For significant Cu substitution rate (x>0.35), the dec rease of the anisotropy field (H(A)) when x increases is strong. For l ower Cu contents, huge values of anisotropy fields make difficult the accurate determination of the substitution effect. The first anisotrop y constant K1 is calculated using the available values of H(A) and M(s ). A linear decrease of K1 is observed from SmCo5 to SMCo2Cu3.