Interaction of localized excitons in semimagnetic quantum wells with manganese spin pairs

In this paper, the secondary emission of different (Zn,Cd,Mn)Se/ZnSe and Zn Se/(Zn,Mn)Se quantum structures and (Zn,Mn)Se layers is studied under reson ant excitation of the energetically lowest exciton state. A pronounced Stok es satellite is found arising from the exciton-induced spin-flip of anti-fe rromagnetically aligned Mn2+ pairs. From the Stokes shift, the nearest-neig hbor Mn2+-Mn2+ exchange constant is precisely determined to J(1)/k(B) = (- 12.8 +/- 0.2) K for (Zn,Mn)Se. An incorporation of 15% Cd does not change t his value within the experimental accuracy. (C) 2000 Elsevier Science B.V. All rights reserved.