In this communication we analyse dynamics of spin interactions in diluted magnetic semiconductor (DMS) systems of II-Mn-VI. Bulk and low dimensional DMS samples are studied with magneto-photoluminescence and optically detected magnetic resonance, including time-resolved option of the latter experiment. The time-resolved experiment enables a direct observation of dynamics of spin-related interactions, by following photoluminescence response induced by pulse of a microwave radiation at magnetic resonance conditions. Influence of excitation conditions (intensity) on the observed dynamics of the signal response is studied. We demonstrate change of spin relaxation mechanism at high excitation conditions, which is due to very efficient spin-flip interactions between localized spins of Mn ions and spins/magnetic moments of free carriers.

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