Magnetic properties of W-Fe alloys.

A recently discovered spin-glass interaction in W-Mn alloys suggested the investigation of W-Fe alloys. Indeed, similarly to the Mn alloys, the crystalline Fe alloys display a spin- glass transition with a spin freezing temperature which increases essentially linearly with Fe content up to 31 at.% Fe where the alloys become amorphous and antiferromagnetic. Above 52 at.% the amorphous alloys become ferromagnetic and above 68 at.% the alloys phase separate with the appearance of crystalline WFe(2) and Fe in an amorphous matrix.