Vinca Institute of Nuclear Sciences
Laboratory for Radiation Chemistry and Physics

Group for Diluted Magnetic Semiconductors
 

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Under the project Magnetic, optical and dielectric properties of crystalline and amorphous systems there is a group in Vinca Institute working on the subject Diluted Magnetic Semiconductors in the bulk and nano form.

Semiconducting and magnetic properties of AII1-xMnxBVI materials (AII= Zn, Cd, Hg, BVI= S, Se, Te, M= Mn, Fe) are investigated. Emphasis is put on the studies of exchange interaction between magnetic ions in the wide-gap semiconductors like Zn1-xMnxTe, and between free carriers and magnetic ions in the narrow-gap materials as Hg1-xMnxTe and Hg1-xMnxSe. Influence of these exchange interactions on the relaxation time of the magnetic ion moments are examined. In Fe-based diluted magnetic semiconductors like Zn1-xFexSe, Zn1-xFexS and Cd1-xFexSe the possible origin of temperature dependent magnetic susceptibility at low temperatures have been studied within a cluster model.

Diluted magnetic semiconductors of A(II)MnB(VI) type in the form of nanostructures are also being studied. This programme includes synthesis and characterization of the nanocrystalline materials, then studies of their magnetic and optical properties. Cd1‑xMnxS quantum dots (QDs) of average size 4.5 nm have been synthesized in our Laboratory using aqueous solution precipitation. The characterization of these materials is in progress.