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AssigneeAsahi Kasei Kabushiki Kaisha
InventorsSHUICHIRO OGAWA, KEIGO TAKEGUCHI, ATSUSHI FUJII
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An optical information recording medium which can eliminate the necessity for the initialization process. A crystallization assisted layer (3) comprising a given material is formed over a substrate (1) on one side thereof, and a recording layer (4) comprising a Ge—Sb—Te alloy is formed directly on the layer (3). Since the recording layer (4) crystallizes immediately after film formation, no initialization process is necessary for the optical information recording medium obtained. Examples of the material of the crystallization assisted layer firstly include materials having a face-centered cubic lattice system crystal structure. Examples thereof secondly include tellurium-free materials having a rhombohedral lattice system crystal structure. An especially preferred crystallization assisted layer is a discontinuous island-like film made of a material comprising bismuth and/or a bismuth compound. Incorporation nitrogen into the crystallization assisted layer provides an optical information recording medium which need not be initialized and has excellent overwrite cyclability.
A method for producing an optical information recording medium which has on one side of a substrate a recording layer of materials whose main components comprise germanium (Ge), antimony (Sb) and tellurium (Te), comprising the steps of:
A method for producing an optical information recording medium which has on one side of a substrate a recording layer of materials whose main components comprise germanium (Ge), antimony (Sb) and tellurium (Te), comprising the steps of:
A method for producing an optical information recording medium which has on one side of a substrate a recording layer of materials whose main components comprise germanium (Ge), antimony (Sb) and tellurium (Te), comprising the steps of:
A method for producing an optical information recording medium which has on one side of a substrate a recording layer of materials whose main components comprise germanium (Ge), antimony (Sb) and tellurium (Te), comprising the steps of:
Dependencies are inferred from the claim text.