Optical and magneto-optical properties of ZnMnO and ZnMnFeO single crystals and thin films

摘要

Single crystals of oxide diluted magnetic semiconductor Zn1-xMnxO have been grown by chemical vapour transport and thin films of Zn1-xMnxO, Zn1-x-yMnxFeyO have been deposited by pulsed laser ablation and rf magnetron sputtering methods. Optical absorption spectra of the obtained crystals and films have features associated with hand-to-hand direct type transitions and d-d crystal-field transitions due to presence of Mn2+ ions. The observed peculiarities of the Faraday rotation for Zn1-xMnxO crystals and films suggest of paramagnetic behaviour. In contrast, Zn1-x-yMnyFeyO film samples exhibit ferromagnetic-like behaviour which is confirmed on typical magnetic field dependence of the Faraday rotation at room temperature.