Information recording medium and method for manufacturing the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTakashi Nishihara, Rie Kojima, Noboru Yamada
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Abstract
A multilayer information recording medium has both good reproducing performance and good recording and rewriting capabilities, as well as good repeated rewriting capabilities even after being archived for a long period of time. The information recording medium has at least a first recording layer and a second recording layer, which generate reversible phase changes between the crystalline phase and the amorphous phase. The first recording layer contains Ge, Te and Bi, while the second recording layer contains Sb and one or more elements M1 selected from a group including V, Mn, Ga, Ge, Se, Ag, In, Sn, Te, Pb, Bi and Au.
Claims62
An information recording medium having at least two information layers, the information recording medium comprising:
- a first information layer including a first recording layer in which a reversible phase change between a crystalline phase and an amorphous phase is caused by optical means or electrical means;
- and
- a second information layer including a second recording layer in which a reversible phase change between a crystalline phase and an amorphous phase is caused by optical means or electrical means,
- wherein the first recording layer contains Ge, Te and Bi, and
- the second recording layer contains Sb and at least one element M1 selected from a group consisting of V, Mn, Ga, Ge, Se, Ag, In, Sn, Te, Pb, Bi and Au.
An information recording medium having at least two information layers, the information recording medium comprising:
- a first information layer including a first recording layer in which a reversible phase change between a crystalline phase and an amorphous phase is caused by optical means or electrical means;
- and
- a second information layer including a second recording layer in which a reversible phase change between a crystalline phase and an amorphous phase is caused by optical means or electrical means,
- wherein the first recording layer contains Ge, Te and Sb, and
- the second recording layer contains Sb and at least one element M1 selected from a group consisting of V, Mn, Ga, Ge, Se, Ag, In, Sn, Te, Pb, Bi and Au.
An information recording medium having at least two information layers, the information recording medium comprising:
- a first information layer including a first recording layer in which a reversible phase change between a crystalline phase and an amorphous phase is caused by optical means or electrical means;
- and
- a second information layer including a second recording layer in which a reversible phase change between a crystalline phase and an amorphous phase is caused by optical means or electrical means,
- wherein both the first recording layer and the second recording layer contain Ge, Te and Bi, and
- wherein at least one of the first recording layer and the second recording layer contains Bi at 1.0 atom % or more.
A method for producing an information recording medium having at least two information layers on a substrate, the method comprising:
- forming a first recording layer that is phase changeable;
- and
- forming a second recording layer that is phase changeable,
- wherein a sputtering target containing Ge, Te and Bi is used in the forming of the first recording layer, and
- a sputtering target containing Sb and at least one element M1 selected from a group consisting of V, Mn, Ga, Ge, Se, Ag, In, Sn, Pb, Te, Bi and Au is used in the forming of the second recording layer.
A method for producing an information recording medium that has at least two information layers, the method comprising:
- forming a first recording layer that is phase changeable;
- and
- forming a second recording layer that is phase changeable,
- wherein a sputtering target containing Ge, Te and Sb is used in the forming of the first recording layer, and
- a sputtering target containing Sb and at least one element M1 selected from a group consisting of V, Mn, Ga, Ge, Se, Ag, In, Sn, Pb, Te, Bi and Au is used in the forming of the second recording layer.
A method for producing an information recording medium that has at least two information layers, the method comprising:
- forming a first recording layer that is phase changeable;
- and
- forming a second recording layer that is phase changeable,
- wherein a sputtering target containing Ge, Te and Bi is used in both the forming of the first recording layer and the forming of the second recording layer, and
- wherein the sputtering target used in the forming of the second recording layer contains Bi at 0.5 atom % or more.
Dependencies are inferred from the claim text.