To provide an optical information recording medium which enables a sufficient contrast to be available in a blue wavelength range, and a high amorphous stability under high temperature environments and successful preservation reliability.
This phase change-type optical information recording medium uses a reversible phase transition phenomenon between a crystalline phase and and an amorphous phase by laser light irradiation with 405±15 nm wavelength. In addition, the medium has at least a phase change recording layer, formed on a substrate and a lower dielectric material layer positioned under the phase change recording layer, and an upper dielectric material layer and a reflective layer positioned above the phase change recording layer. Besides, the recording layer is composed mainly of GeαSbβ(5<α<25, 75<β<95), and contains an additional element for cubic crystallization which totals 10 to 40 atomic% to the main component, and the crystalline structure of the recording layer is the cubic crystal.
YUZURIHARA HAJIME
HANAOKA KATSUNARI
KANEKO YUJIRO
Yasuo Yoshimura
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