In last decades there has been a great deal of study focused on transition metal doped II-VI wide band gap semiconductors because of their attractive fundamental properties and numerous application possibilities. Among the most spectacular of these properties is the giant Faraday rotation, which in II_1-xMn_xVI  alloys is two orders greater than that in conventional semiconductors. The Faraday rotation in bulk crystals can be significantly changed by varying kind and content of magnetic ions, temperature and external magnetic field. Recent progress in nanotechnology opens new way for further flexibility in such "Faraday rotation engineering". In this work, we present results of optical and magneto-optical studies of  II_1-xMn_xVI bulk crystals, thin films and nanocrystals. The Cd_1-xMn_xS single crystals were grown using vapor transport method. For growth of Cd_1-xMn_xTe single crystals Bridgman method has been applied. Growth of thin layers of both materials has been performed by pulsed laser deposition and RF-diode sputtering technique. Pulsed laser deposition technique has been also modified for fabrication of Cd_1-xMn_xTe nanocrystals embedded in SiO₂ matrix. The synthesis of Cd_1-xMn_xS nanoparticles was performed by colloidal chemistry technique at room temperature and under ambient conditions. Optical absorption and Faraday rotation measurements were carried out in range of (320-900) nm at temperatures of (5-300) K. The observed spectral dependence of the Faraday rotation for Cd_0.97Mn_0.03S colloidal nanoparticles in polyvinylalcohol solution suggests of exhibition of a negative part due to s p-d exchange interaction contribution. This is case typical for semimagnetic semiconductors with large exchange interaction between manganese ions and band carriers. Possible mechanisms for the observed difference between spectral, magnetic field and temperature dependence of the Faraday rotation for the studied materials in form of bulk and nano will be discussed.

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