Optimization of Crystallization Characteristics for Phase-Change Optical Disk with Ag–Ge–Sb–Te Recording Film

Autor:	Reiji Tamura, Nobuhiro Tokushuku, Miyamoto Makoto, Yasushi Miyauchi, Motoyasu Terao, Akemi Hirotsune
Rok vydání:	2007
Předmět:	Materials science Physics and Astronomy (miscellaneous) General Engineering Analytical chemistry General Physics and Astronomy law.invention Bond length Crystal law Transmission electron microscopy DVD-RAM Crystallization Chemical composition Optical disc Jitter
Zdroj:	Japanese Journal of Applied Physics. 46:6652-6657
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.46.6652
Popis:	A Ag–Ge–Sb–Te recording film was developed, and its chemical composition was optimized to minumize overwrite jitter. The cause of the jitter was investigated by measuring the crystallization ratios and by transmission electron microscopy. It was found that the overwrite jitter increased with a shortage of Ge or Ag because the crystallization speed increased when these elements were added, while it increased with an excess of Ge or Ag because the crystallization speed decreased when these elements were added. A model based on the atomic bond distance and the strength of interatomic interactions in the crystal was devised. The model can be used to explain the mechanism by which a slight change in the chemical composition of recording films changes the crystallization speed. It was confirmed that the proposed disk with recording film having a small amount of Ag had the minimum overwrite jitter (under 10%).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2ea8852dc86086f4acaf500d9633c07d https://doi.org/10.1143/jjap.46.6652 Zobrazit plný text záznamu