Determination of spin relaxation times in DMS nanostructures with 2D electron gas is one of the crucial aims of magneto-optical investigations. In this communication we demonstrate power of a new experimental method developed by us. Time-resolved ODMR is applied to determine spin-related relaxation times in a range of II-VI DMS heterostructures. We investigated ZnMnSe/ZnBeSe and CdMnTe/CdMgTe heterostructures with magnetic quantum wells and with a low density of 2D electron gas. Influence of a microwave radiation (60 GHz ) on excitonic transitions in above-mentioned heterostructures was studied. Setting conditions of magnetic resonance of Mn²⁺ ions we could suppress magnetization of structures studied. Also a nonresonant (by moving magnetic field out of the resonance) magnetization quenching was observed imposed by a heating of spin subsystem caused by interaction with microwave heated free electrons. These two effects could be separated in a time-resolved study. We could thus directly evaluate their importance and measure characteristic relaxation times for spin-lattice and spin-2D carriers interactions.

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