As the size of metal or semiconductor particles decreases to a nanometer scale there can appear new optical and magneto-optical properties. For composite materials consisting of dielectric matrix and the embedded semiconductor nanoparticles the Faraday rotation should depend not only on particle size and shape but also to be a function of interparticle distance. Our previous findings suggest of large enhancement of the Faraday effect for CdMnTe nanoparticles in glass composites when compared to the bulk crystals. This experimental result has to be still confirmed for other systems and for nanoclusters embedded in different dielectric matrices. In this work we present results of magneto-optical studies of composite films containing II-VI based semiconductor nanoparticles prepared by different techniques. The composite films IIMnVI were prepared by growth of the nanoparticles embedded in SiO₂ matrix with using pulsed laser deposition, magnetron sputtering, embedding of semiconductor nanoparticles into polymer matrix and growth by melting of the semiconductor doped fine powder borosilicate glasses. New chemical approach to synthesis of CdMnS nanoparticles in polymer matrix has been proposed. There were found peculiarities in spectral, temperature and magnetic field dependences of the Faraday effect for the studied composite films which can be attributed to the influence of the reduction of dimensionality on spin exchange parameters for this class of materials. Possible application of the studied materials is discussed. The work was supported by grants No. M/128-2004 and No.D3/152-2005 from Ministry of Education and Science of Ukraine.

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