Magnetic properties of the 3d-based metallic glasses at ductile-brittle transition

Abstract
The magnetic properties of some Co- and Fe- based amorphous metallic alloys at ductile-brittle transition after annealing are presented and discussed. It was found that the temperature dependences of magnetization of annealed samples qualitatively coincide with those of as-quenched ones, but the Curie temperature values T_c are rising. Therewith, from the temperature dependences of magnetic susceptibility X(T) within the paramagnetic region for the investigated ribbons it is followed that value of the mean effective moment per alloy atom μ is rising with annealing temperature T_a. Such behaviour of T_a and μ is connected with chemical short-range ordering changes and formation of the microinhomogeneities in subsurface layers with amorphous structure enriched with transition metal atoms in comparison with as-quenched ribbons.