Magneto-optical Faraday effect in II–VI based semimagnetic semiconductor nanocrystals

Abstract

Different physical and chemical methods were used to prepare II–VI based semimagnetic semiconductor nanocrystals. A study of magneto-optical Faraday effect in the nanocrystals revealed its enhancement as compared with bulk crystals. It is explained in framework of increase in the oscillator strength of exciton transitions and to the difference between these strengths in an external magnetic field. It was observed almost linear dependence of the Faraday rotation as function of magnetic field strength for nanocrystals at liquid helium temperature in contrast to the dependence with saturation in bulk case and changes in process of a transition of the semimagnetic nanocrystals from the paramagnetic state to a spin glass state.