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Proceedings Paper

New quaternary material for high-speed phase-change optical recording
Author(s): Geeta Mongia; Promod K. Bhatnagar
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Paper Abstract

Over recent years the demand for mass storage devices with high speed has become increasingly more evident. Phase change optical recording is based on the rapid crystalline to amorphous (and vice versa) transition in a thin phase change layer enabled by laser induced heating. Among some of the potential candidates, AgInSbTe alloy appears to be one of the latest promising materials that has drawn world wide attention. The optical disk of this material with overwrites cyclability of more than 105 times, and data rate 22Mbps has been reported for DVD 4.7GB. Using this material as the active layer has other advantages such as the problem of material flow is reduced to a great extent. Moreover the marks written in AgInSbTe based media have a well defined shape with sharp edges, leading to intrinsically lower jitter values than observed for GeSbTe based media. In the present work [(AgSbTe)x(In1-y Sby)1-x] alloy and films are developed for different values of x and y. The crystallization process of Ag-In-Sb-Te films with above composition is systematically reported and compared for the first time. Thermal properties of the alloy and film are studied using X-Ray Diffraction (XRD) technique. The analysis of the film is done before annealing and also after 1hr. isothermal annealing at temperature between 200 degree(s)C and 500 degree(s)C. The structural analysis of the film is also done under same conditions (before and after annealing) using Scanning Electron Microscope (SEM) respectively. The experimental results of the analysis are presented here for compositions close to the eutectic Sb69Te31, in which some of the Te is replaced by Ag and In.

Paper Details

Date Published: 4 September 2002
PDF: 8 pages
Proc. SPIE 4768, Novel Optical Systems Design and Optimization V, (4 September 2002); doi: 10.1117/12.482186
Show Author Affiliations
Geeta Mongia, Univ. of Delhi (India)
Promod K. Bhatnagar, Univ. of Delhi (India)


Published in SPIE Proceedings Vol. 4768:
Novel Optical Systems Design and Optimization V
Jose M. Sasian; R. John Koshel, Editor(s)

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