HIGH-FIELD FARADAY-ROTATION IN A THIN-FILM OF SINGLE-CRYSTAL EUTE

High magnetic field effects on the magnetic exciton in EuTe were inves tigated with a Faraday rotation measurement to compare with the usual magnetization measurement. Thin films of EuTe which were epitaxially g rown with the hot wall method were used in the experiments. The field dependence of the Faraday rotation for non-resonant light is in good a greement with the normalized magnetization curve. The field dependence for resonant light with the transition (4f)7-(4f)6(5d) is not consist ent with the magnetization curve. The inconsistency is considered to b e due to the non-linear dependence of the rotation angle for resonant light. The temperature characteristics show an increase of the high fi eld Faraday rotation in liquid He temperature corresponding to the sho rt-range order like magnetic polarization around the optically excited Eu2+ ions.