Magnetic and magneto-optical properties of perpendicular magnetic Nd-Fe-Co and Pr-Fe amorphous films

Perpendicularly magnetized amorphous Pr
x
Fe
100-x
films were successfully fabricated by r.f. sputtering for
30\leq\times\leq60
. The dependence of the Curie temperature T
c
on Pr content is in accordance with that of the melt -spun samples, except for x larger than 50. The change in K
u
with temperature of Pr-Fe films is similar to that in Nd-Fe-Co, and there seems to be a transition in anisotropy mode from uniaxial to conical. The dependence of polar Kerr rotation angle θ
k
on wave length in Pr-Fe and Nd-Fe-Co films suggests a contribution of Nd and Pr to the magneto-optical effect.