Abstract
In CdCr2Se4 single crystals the influence of incident radiation intensity on the spectral dependences of Faraday rotation (FR) and circularly polarized light absorption near the fundamental absorption edge was investigated. A strong growth of the resonant structure at the absorption edge and the Faraday rotation in the band associated with this resonance takes place as the laser radiation intensity increases. The non-linear Faraday rotation is a non-monotonic function of the radiation intensity. The maximum increase of the Faraday rotation approximates 100% of the linear effect value. At the highest radiation intensity a decrease of the non-linear FR effect is observed. The non-linear effects in absorption and FR are due to the influence of photoexcited charge carriers on an excitonic resonance. A non-linear FR of lesser value was observed also in the ferromagnetic semiconductor CdCr2Se2.3S1.7.
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