MAGNETOOPTICAL PROPERTIES OF CD1-XMNXSE MICROCRYSTALLITES IN SIO2 GLASS PREPARED BY RF-SPUTTERING

Cd1-xMnxSe microcrystallites have been successfully prepared by rf sputtering in SiO2 matrix glass. Optical absorption edge shows high energy shifts of 20-550 meV to the high energy as compared to its position in bulk crystals; these shifts are interpreted as evidence for exciton confinement in the microcrystallites. Annealing of the Cd1-xMnxSe microcrystallites at 450-650-degrees-C for 0.5-5 h increases the size of the microcrystallites from 20 to 250 angstrom. In an external magnetic field of 7 T the absorption edge shifts by 40 meV towards the low energy side due to the exchange coupling of the excitons with the d electrons of Mn2+ ions in the Cd1-xMnxSe microcrystallites. The spectral red shifts of the exciton luminescence in the Cd1-xMnxSe microcrystallites are also observed in the presence of magnetic fields. The corresponding effective g value varied from 138 at 1 T to 99 at 7 T.