Magnetic Moment and Curie Temperature in Amorphous Co-R Alloys

The magnetic properties of amorphous Co100-xYx (50 ¿ x ¿ 70) alloys prepared by a melt-quenching method were studied. Based on the results derived from the Co-Y alloys, the magnetic moment of Co and the Curie temperature in amorphous Co100-xRx (R = Pr, Nd, Sm, Gd, Dy, Er) alloys are discussed. The Co atoms no longer sustain a moment when x ¿ 60. The exchange integral between R and R atoms or between R and Co atoms rapidly decreases as the atomic number of the lanthanide element increases.