At present the existing or absence of room temperature ferromagnetism in zinc oxide-based diluted magnetic semiconductors is main point for discussion and an increased interest to these materials. It was found that their magnetic properties depend on content of magnetic ions and the growth parameters. In this work single crystals of Zn_1-xMn_xO with 0<x<0.1 were grown by chemical vapour transport technique. Thin films of Zn_1-xMn_xO (x=0; 0.06; 0.1) and Zn_1-x-yMn_xFe_yO (x=0.05; y=0.07) were deposited by pulsed laser ablation and rf magnetron sputtering methods on quartz and sapphire substrates. Optical absorption, magnetoabsorption and Faraday rotation spectra were measured at temperature range of (5-400) K in magnetic field up to 25 T. In the absorption spectra new structure has been found which can be attributed to the charge-transfer transitions. The observed peculiarities in magneto-optical spectra in Zn_1-xMn_xO single crystals and thin films are explained in framework of strong spin exchange interaction between d-electrons of Mn²⁺ and s,p - band carriers. The revealed negative sign of the Faraday rotation angle, typical temperature and magnetic field dependences suggest of paramagnetic state of Zn_1-xMn_xO single crystals and thin films. On the other hand, Zn_1-x-yMn_xFe_yO film samples exhibit ferromagnetic-like behavior at room temperature. Origin of this ferromagnetic ordering is discussed. Application of the studied materials for spintronic purposes is considered. The work was supported partially by grants No. M/128-2004 and No.D3/152-2005 from Ministry of Education and Science of Ukraine.

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