We provide an experimental evidence and a theoretical substantiation for a strong reduction of the s-d exchange interaction between electrons and Mn-ion spins with increasing degree of the confinement in nanostructures of diluted magnetic semiconductors. By spin-flip Raman scattering a strong (up to $25%$) reduction of the exchange parameter is observed in (Cd,Mn)Te/(Cd,Mn,Mg)Te quantum well structures. As a responsible mechanism we suggest switching-on of the kinetic exchange for the conduction electrons with finite k vectors. Quantitative agreement between experimental data and calculations is achieved.
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Merkulov et al. (1999) studied this question.
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