We report on study of magnetic impurities spin relaxation in diluted semiconductors above Curie temperature. Systems with a high concentration where correlations take place were studied. The developed theory assumes that main channel is mobile carriers providing indirect interactions between impurities. Our theoretical model supported by experimental measurements manganese time GaMnAs means spi...

Optical detection of magnetic and cyclotron resonances enables not only to study magnetic and cyclotron resonances by observation of light emission modifications, but also allows identification of channels of radiative and nonradiative recombination in a given material. In the present review we shortly describe applications of the two optically detected resonance methods for studies of magneto-...