Magnetic and transport properties of Gd-Ni amorphous alloys

Magnetic and transport measurements made on Gd
x
Ni
1-x
sputtered amorphous film alloys indicate that these alloys are ferrimagnetic with the Gd and Ni coupled antiparallel. The nickel magnetic moment appears to become small with increasing x. As a consequence the Curie temperature show a pronounced minimum at x ≈ 0.2 with T
c
about 40°K. Although the nickel moment is reduced the Ni is assigned a large negative Hall effect, e.g. for x ≈ 0.2 the tangent of the Hall angle is -.014, in order to account for the magnitude as well as the change in sign of the Hall effect with both temperature and composition in the binary alloys.