Low Temperature Magnetic Properties of Amorphous Co-R (R=Pr,Nd,Sm) Alloys

Measurements of the magnetization and susceptibility of amorphous Co_100-x R_x (R=Pr,Nd,Sm; 50 ≤ × ≤ 70) alloys prepared by a rapid quenching technique, at temperatures ranging from 4.2 to 300 K, were carried out. The magnetic behavior of the Co-R amorphous alloys was discussed in terms of a local moment model. It is suggested that the Co ions lose their moment around x = 60, assuming that the rare earth ions retain their normal R³⁺ character, and that the magnetic contributions of R in these disordered systems are similar.