Abstract
Optical and magneto-optical properties of metal-insulator (CoFe)x(Al2O3)1−x granular films have been investigated. The results have been compared with the experimental data of the magnetorefractive effect in the IR region. The optical and magneto-optical spectra of the films depend strongly on the volume fraction of ferromagnetic particles. It was found that the Kerr effect is substantially increased in the spectral region of the plasma frequency. It was revealed that appearance peculiarities observed in the magnetoreflection spectra at 7.5–9.5μm are associated with the excitation of longitudinal phonon modes in the Al2O3 dielectric matrix. It has been shown that both intraband and interband electron transitions contribute to the magnetoresistivity as well as to the IR magnetoreflection. The optical and magneto-optical properties of the (CoFe)x(Al2O3)1−x granular films can be interpreted in the frame of the effective-medium approximation. The magnetorefractive effect can be explained in terms of the modified Hagen-Rubens relation.
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