Rewritable optical data storage medium and use of such a medium

G - Physics – 11 – B

Patent

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G11B 7/24 (2006.01)

Patent

CA 2544394

A rewritable optical data storage medium (20) for high-speed recording by means of a focused radiation beam is described. The medium (20) comprises a substrate (7) carrying a stack (2) of layers, which stack (2) comprises, a substantially transparent first auxiliary layer I1 (3), a substantially transparent second auxiliary layer I2 (5) having a thickness dI2, and a recording layer (4) of a phase-change material having a thickness dp and comprising at least a composition GexSnySb1-x-y, where 0.05 < x < 0.30 and 0.15 < y < 0.30. The recording layer (4) is interposed between I1 and I2. A third auxiliary layer I3 (6) with a thickness dI3 acting as a heat sink is being present at a side of I2 opposite to the side of the recording layer. The following formula is fulfilled .lambda.I2/dI2 > 5* 108 W m-2 K-1, in which formula .lambda.I2 is the heat conduction coefficient of the material of the I2 layer. Thus an optical data storage medium is provided capable of being recorded at a relatively high linear recording speed of about 35 m/s or more.

Ce support optique réinscriptible (20) de stockage de données sert à l'enregistrement à haute vitesse au moyen d'un faisceau de rayonnement focalisé. Le support (20) comprend un substrat (7) qui porte une pile (2) de couches, chaque pile (2) comprenant une première couche auxiliaire I1 (3) sensiblement transparente, une deuxième couche auxiliaire I2 (5) sensiblement transparente d'une épaisseur d<SB>I2</SB> et une couche d'enregistrement (4) en un matériau à changement de phase ayant une épaisseur d¿p? et comprenant au moins une composition Ge¿x?SN¿y?Sb¿1-x-y?, où 0,05 < x < 0,30 et 0,15 < y < 0,30. La couche d'enregistrement (4) est intercalée entre les couches I1 et I2. Une troisième couche auxiliaire I3 (6) d'une épaisseur d<SB>I3</SB>, qui agit comme un puits thermique, est agencée du côté de la couche I2 opposé au côté de la couche d'enregistrement. La formule suivante est satisfaite : .lambda.<SB>I2</SB>/d<SB>I2</SB> > 5*10?8¿ w M?-2¿k?-1¿, .lambda.<SB>I2</SB> représentant dans la formule le coefficient de conductivité thermique du matériau dont la couche I2 est constituée. On obtient ainsi un support optique de stockage de données sur lequel il est possible d'enregistrer des données à une vitesse d'enregistrement linéaire relativement élevée de 35 m/s environ ou davantage.

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