Magnetic Properties of Rapidly Quenched (Gd-M)80Si12B8 Amorphous Alloys

The magnetization and Curie temperature of rapidly quenched (Gd0.7M0.3)80Si12B2 (M=Y, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Al) amorphous alloys were investigated. The Curie temperatures of alloys with M=Mn, Fe are higher by about 70K and 120K than that of Gd80Si12B8 amorphous alloy. The magnetic moments of Mn, Fe and Co atoms are 2,1 and 1¿B respectively. These magnetic moments are antiparallel to that of the Gd atoms. The magnetic moment of Ni atoms nearly disappears; the magnetic moments of Y and V atoms are 1.7 and 2.1¿B respectively. The magnetic moment of Y atoms is antiparallel to that of Gd atoms, while that of V atoms is parallel to the latter. We conclude that alloys with nonmagnetic elements M exhibit asperomagnetism in which the Gd moments are distributed, while alloys with magnetic elements M have a ferrimagnetic order.