A NEW ULTRA-VIOLET MAGNETOOPTICAL SPECTROSCOPIC INSTRUMENT AND ITS APPLICATION TO CO-BASED MULTILAYERS AND THIN-FILMS

A magneto-optic measurement system for the 1.4-6.8eV photon energy ran ge (lambda=182-886 nm) is realized. A new technique to calibrate the a pplied modulator in-situ, essential for accurate measurements over suc h a wide range of photon energies, is demonstrated. Measurements at Co /Pt multilayers with 3 Angstrom Co layers and various Pt layer thickne sses indicate a peak for the polar Kerr rotation (similar to -0.5 degr ees) at about 5.1eV, which is not present in CoPt3 alloy film. This fe ature may be partly due to quantum web effects, but there is also a po ssibility for an optical interference effect. Furthermore, positive Ke rr rotations up to about +0.4 degrees were found at photon energies ab ove 5.7eV.