Abstract
The magneto-optic Kerr spectra (λ = 250 ∼ 700 nm) of amorphous Gd-Co, Tb-Co, Nd-Co and Ce-Go are compared with those of Y-Co films. It has been found that Kerr rotation of RE-Co is mainly due to Co in the long wavelength region, whereas at short wavelength Gd, Nd and Ce contribute positively, and Tb contributes negatively to the Kerr rotation of RE-Co amorphous alloy films. Only Kerr rotatIon of Nd-Co increases with decreasing wavelength and shows a maximum at about 300 nm.
