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Laser ablated zinc ferrite (ZnFe 2 O 4 ) films deposited at O 2 pressure of 0.16 mbar onto fused quartz substrates are nanocrystalline and display net magnetic moment dependent on the substrate temperature (T s ) during deposition. At T s = 350 °C, the room 4πM s reached the maximum of 3 kG. The films were studied by spectral ellipsometry and magnetooptical (MO) Kerr effect spectroscopy at photon energies between 1 and 5 eV at room temperature in the longitudinal magnetic flux density 1.14 T. The optical and MO spectra show structural details typical for inverted spinels. Our ZnFe 2 O 4 samples display amplitudes somewhat reduced with respect to those in other ferrimagnetic oxides with the exchange coupled Fe3+ pairs, i.e., in Li 0.5 Fe 2.5 O 4 and MgFe 2 O 4 spinel ferrite and magnetoplumbite, PbFe 12 O 19 . The lower amplitudes are probably due to the interplay of nanocrystalline nature and lower degree of spinel inversion in the ZnFe 2 O 4 laser ablated films.

The authors consider magnetooptical spectroscopic studies of Pt/Co multilayers grown onto glass by dual electron beam evaporation an RF-sputtered Co rich Pt/sub x/Co/sub 1-x/ alloy films. Simultaneous polar and longitudinal magnetooptical Kerr experiments were carried out in the spectral range between 1.5 and 5.2 eV. The effect of the deposition temperature and that of subsequent heat treatment on the Kerr spectra is studied. In alloys Kerr rotation reached the value of 0.66 deg at 4.3 eV for x=0.41. >