Recording Characteristics of Ge Doped Eutectic SbTe Phase Change Discs with Various Compositions and Its Potential for High Density Recording

Authors describe the recording characteristics of discs having Ge doped eutectic SbTe alloy recording films with various compositions. The recording characteristics are sensitive on the film composition. For recording condition, the Sb/Te ratio of around 4 and the Ge content of about 5 at.% were pre...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2002, Vol.41 (Part 1, No. 3B), p.1695-1697
Main Authors: Oomachi, Noritake, Ashida, Sumio, Nakamura, Naomasa, Yusu, Keiichiro, Ichihara, Katsutaro
Format: Article
Language:English
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Summary:Authors describe the recording characteristics of discs having Ge doped eutectic SbTe alloy recording films with various compositions. The recording characteristics are sensitive on the film composition. For recording condition, the Sb/Te ratio of around 4 and the Ge content of about 5 at.% were preferable to obtain good carrier to noise ratio (CNR). A disc with eutectic recording film of that composition is compared with one with a GeTe-Sb2Te3 pseudo-binary alloy recording film, varying the mark length and the track pitch. The eutectic disc showed better CNR for the shorter mark lengths than the pseudo-binary disc. The cross-erase ratio of the eutectic disc is higher than that of the pseudo-binary disc. Result suggests that the eutectic disc is suitable for higher linear bit density and the pseudo-binary disc is suitable for higher track density. 9 refs.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.41.1695