Composition and annealing dependence of magnetic properties in amorphous Tb-Co based alloys

The aim of the work is to study the magnetic properties of Tb1-xCox amorphous alloys with respect to the composition and annealing temperature. The samples have been prepared by the de triode co-sputtering. The most important results are: (1) Curie temperature is higher than the room temperature for the magnetic samples with Co content x >0.6, before annealing rises T-c with Co content. Crystallization commences at approximately 400 degreesC. (2) A significant high field susceptibility, even up to 8 Tesla, confirms the sperimagnetic structure. (3) A biaxial anisotropy occurs before annealing due to stress, but a uniaxial anisotropy is induced by the field annealing; the anisotropy value is dependent upon composition. (C) 2001 Elsevier Science B.V. All rights reserved.