ANOMALOUS MAGNETIC-BEHAVIOR OF (TB0.27DY0.73)(0.32)FE-0.68 AMORPHOUS THIN-FILM

Very high coercive fields have been observed at low temperatures in an amorphous (Tb0.27Dy0.73)(0.32)Fe-0.68 sputter deposited thin film. Co ercive field data are presented for films of different thickness. A ve ry sharp decrease of the coercive field, similar to that in 'bulk' amo rphous REFe2 (RE=rare earth), has been observed. The time effect on th e remanent magnetisation has also been measured which is similar to th at of superparamagnetic particles. The large values and the drastic te mperature variation of the coercive field is very well explained by th e partial breaking uh of the long range magnetic order due to the pres ence of RE spins distributed randomly in the amorphous matrix. (C) 199 8 Elsevier Science S.A.