Recent measurements of the Faraday rotation in the visible and near infrare
d spectral region on the copper ferrite films prepared by the sputtering me
thod showed the anomalous behavior of rotation at 1.8 mum wavelength. Suppo
sing the presence of Cu2+ ion on the A site under the cubic crystal field V
(T-d), the spin-orbit coupling zeta (l . s), the low symmetry crystalline f
ield V(S-4), and the molecular field AS(z)[S-z(Fe)] from the iron spin [S-z
(Fe)], we can calculate the line shape of the observed anomaly.