Diluted magnetic semiconductors exhibit many interesting properties such as magnetic, magneto-optical, and magneto-electronic ones. In this work the RT ferromagnetism is observed in chemically synthesized samples of Sn1-xCoxO2 compound (x=0.07 and 0.1). the deposited films were annealed in 02 atmosphere at T=450 oC. Magnetic properties of the samples were measured by MO Kerr effect system. The absorption spectra a(hw) of SnO2:Co films were recorded on Fourier-transform spectrometer. Raman-scattering experiments were made at 300 K and in the magnetic fields up to 5 kOe. A interband absorbtion edge is revealed at ~3.4-3.6 eV. The a(hw) increases with doping Co in-gap. The absorption spectra show addtional shoulders at ~3.9 and 4.8 eV. The peaks in the Raman spectra for Sn1-xCoxO2 films at ~634, ~775 and ~477 cm-1 resemble the vibration modes of microcrystal SnO2. Additional Raman peak at ~545 cm-1 may be related to the Co2+ ions vibrations or polaron formation including O-vacancy presence. The peak positions of main Raman lines did not show any measurable change in external magnetic field, but the intensities of the additional peaks at ~545 cm-1 enhances whereas the applied magnetic field H increases. Our measurements of the absorption and the Raman spectra show that the vacancies tend to form a near-neighbour complex with Co atoms suggesting a spin-polaron magnetism.

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1. Magneto-optical and electron transport properties of Co-based amorphous and nanocrystalline ribbons