Abstract
The magneto-optical properties of semimagnetic superlattices based on Mn containing II–VI alloys are reviewed. This covers mainly the two families of materials CdTe/Cd 1− x Mn x Te and ZnSe/Zn 1− x Mn x Se. Inter-band measurements have been made of reflectivity, photoluminescence (PL) and PL excitation (PLE) spectroscopy in both systems, and a subject of particular interest has been the observation of a type I to type II superlattice transition induced by magnetic field and the large sp-d exchange interaction with the Mn d-shell. Conflicting reports of the observation of this effect have been made in the CdTe/Cd 1− x Mn x Te system due to the large change in the excitonic binding energy which also occurs at the transition. By contrast very clear evidence is seen in the Zn family of compounds, and this has been developed to include the observation of a spin superlattice in which the quantum wells are in opposite materials for opposite spin orientations of the holes. Simple envelope function calculations describe the electronic states well for long-period structures butt a detailed description of short-period structures, and cases where a magnetic field is applied in the plane of the layer, are not yet well understood. Both magnetic polaron and LO phonon polaron effects have been observed in the CdTe/Cd 1− x Mn x Te systems due to the strong magnetic coupling and the large polar coupling in these materials.
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