New quaternary material for high-speed phase-change optical recording

Geeta Mongia; Promod K. Bhatnagar

doi:10.1117/12.482186

4 September 2002 New quaternary material for high-speed phase-change optical recording

Geeta Mongia, Promod K. Bhatnagar

Proceedings Volume 4768, Novel Optical Systems Design and Optimization V; (2002) https://doi.org/10.1117/12.482186
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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(In_1-y Sb_y)_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.

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Geeta Mongia and Promod K. Bhatnagar "New quaternary material for high-speed phase-change optical recording", Proc. SPIE 4768, Novel Optical Systems Design and Optimization V, (4 September 2002); https://doi.org/10.1117/12.482186

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KEYWORDS

Crystals

Annealing

Antimony

Scanning electron microscopy

Silver indium antimony tellurium

Optical recording

Tellurium

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