Optical and magneto-optical studies of composite materials containing semimagnetic semiconductor nanoparticles

Andriy I. Savchuk ,  Volodymyr I. Fediv ,  Tetyana A. Savchuk ,  Ihor D. Stolyarchuk ,  Yevheniy O. Kandyba ,  Dmytro I. Ostafiychuk ,  Svitlana A. Ivanchak ,  Vitaliy V. Makoviy 

Chernivtsi National University (ChNU), 2 Kotsubinsky Str., Chernivtsi 58012, Ukraine

Abstract

Сomposite films containing semimagnetic semiconductor  nanoparticles have been prepared by different physical and chemical techniques. Cd1-xMnxTe based films were fabricated by RF magnetron sputtering from a composite target. The incorporation of semiconductor nanoparticles into the SiO2 matrix was achieved with a pulsed laser deposition technique. A new chemical approach for the synthesis of Cd1-xMnxS nanoparticles in a polymer matrix of polyvinylalcohol has been proposed. A similar polymer matrix was used also for embedding of Pb1-xMnxI2 and Zn1-xMnxO nanoparticles. The optical absorption edge for Cd1-xMnxTe nanoparticles and the exciton structure in the spectra of Cd1-xMnxS, Pb1-xMnxI2, Zn1-xMnxO nanoparticles shifted to the higher-energy side compared to those for bulk crystals due to the quantum confinement effect. The magneto-optical Faraday effect for non-magnetic semiconductor/glass nanocomposites demonstrate only small changes as compared with that of bulk semiconductors. The revealed peculiarities in spectral and magnetic field dependence of the Faraday rotation for the semimagnetic semiconductor based composite films can be attributed to the influence of the dimensionality on spin exchange parameters for such kind of nanostructures. According to the magnetic field dependence of the Faraday rotation all the studied composite samples exhibit paramagnetic behaviour. The magneto-optical properties of the nanocomposites suggest possible applications for optical isolators and magnetic sensors.  The work was supported by a grant from the Ministry of Education and Science of Ukraine.

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Presentation: Poster at E-MRS Fall Meeting 2008, Symposium F, by Tetyana A. Savchuk
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-09 11:25
Revised:   2009-06-07 00:48
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