Comparative study of II-VI based diluted magnetic semiconductors in form of bulk crystals, thin films and nanocrystals

Andriy I. Savchuk ,  Volodymyr I. Fediv ,  Ihor D. Stolyarchuk ,  Serhiy A. Savchuk 

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

Abstract

The giant Faraday effect is one of the remarkable properties of diluted magnetic semiconductors type of II1-xMnxVI. Namely this effect has provided fertile ground for different optoelectronic applications including magnetic field sensors. In this work, the focus is on comparative magneto-optical study of CdMnTe, ZnMnTe, CdMnS in form of single crystals, thin films, nanocrystals and their application in magnetic field sensing. Single crystals were grown by the Bridgman method. Pulsed laser deposition technique has been applied to prepare thin films of CdMnTe. Growth regimes have been found for which physical characteristics of the thin films are similar to those for bulk material. Pulsed laser deposition technique was also applied for fabrication of CdMnTe and CdMnS nanocrystals embedded in SiO2 dielectric matrix. In Faraday rotation spectrum of CdMnTe film typical S-shape dispersion can be seen. The obtained results correlate with the data of the giant Faraday effect in the single crystals. Spectral dependence of Faraday rotation for nanocrystals of CdMnTe grown by laser deposition technique was found to be qualitatively similar to that of the related thin films. However, it was found additional enhancement of the Verdet constant in case of nanocrystal material almost for one order. The variant of one-way sensor scheme was used for designing of magneto-optical magnetic field sensor. Advantage of using thin films and nanocrystals in magnetic field sensing is low cost of manufacturing of such materials. This work was supported in part by grants No.M/128-2004 and No. D3/152-2005 from Ministry of Education and Science of Ukraine.

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Presentation: Poster at E-MRS Fall Meeting 2006, Symposium F, by Andriy I. Savchuk
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-14 09:54
Revised:   2009-06-07 00:44
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