Magneto-optical study of interface mixing in the CdTe-(Cd,Mn)Te system

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Abstract
We present in detail a quantitatibe description of Zeeman splittings of exciton states in a nonmagnetic quantum well with diluted-magnetic-semiconductor barriers which takes interface mixing into account. For structures with high Mn concentration in the barrier we show that this effect leads to a dramatic increase of the Zeeman splitting even to a value exceeding the barrier splitting. We describe a method of interface characterization based on Zeeman-effect measurements. It enables one to study the shape of the interface profile, the influence of the growth conditions on the interface, and provides a perspective to decouple the influence of interface mixing from truly two-dimensional magnetic effects in studies of ultrathin magnetic layers. The influence of the parameters of the model on the results obtained and the practical applicability of the method are discussed. In particular, we show that the quantum well profile is strongly asymmetric in relation to the growth direction and we demonstrate the small influence of the intrinsic effect in relation to interface magnetism.