EP0304873A1
Expired / Lapsed
EP
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Magneto-optical recording medium
Assignee: Sony Corp
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Filing: 1988-08-23
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Granted: —
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Expires: 2008-08-23
Abstract
Abstract A magneto-optical recording medium is disclosed in which a magneto-optical recording layer is formed by alternately stacking Co layers and Pt and/or Pd layers, and having a total thickness between 50 and 800 Å. Each of the Co layers and Pt and/or Pd layers has a preferable thickness range.
Inventors
- 👤 Yoshitaka Ochiai
- 👤 Koichi Aso
- 👤 Shiyunichi Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 09:27
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B11/10589
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
53 words
A magneto-optical recording medium comprising a substrate, and a magneto-optical recording layer formed on a substrate, said magneto-optical recording layer having a multi layered structure formed by alternately stacking layers formed of Co, and layers formed of Pt and/or Pd, said magneto-optical recording layer having a total thickness between 50 and 800 Å.
Claim 2
Dependent Claim
53 words
A magneto-optical recording medium comprising a substrate, and a magneto-optical recording layer formed on a substrate, said magneto-optical recording layer having a multi layered structure formed by alternately stacking layers formed of Co, and layers formed of Pt and/or Pd, said magneto-optical recording layer having a total thickness between 50 and 800 Å.
Claim 3
Dependent Claim
20 words
A magneto-optical recording medium according to claim 1, wherein said layers formed of Pt and/or Pd are formed of Pt.
Claim 4
Dependent Claim
40 words
A magneto-optical recording medium according to claim 2, wherein each of said layers formed of Co has a thickness between 2 and 8 Å and each of said layers formed of Pt has a thickness between 3 and 40 Å.
Claim 5
Dependent Claim
20 words
A magneto-optical recording medium according to claim 1, wherein said layers formed of Pt and/or Pd are formed of Pd.
Claim 6
Dependent Claim
40 words
A magneto-optical recording medium according to claim 4, wherein each of said layers formed of Co has a thickness between 1 and 9 Å and each of said layers formed of Pd has a thickness between 2 and 40 Å.
Claim 7
Dependent Claim
21 words
A magneto-optical recording medium according to claim 3, said magneto-optical recording layer has a total thickness between 50 and 400 Å.
Claim 8
Dependent Claim
74 words
A magneto-optical recording medium comprising a substrate, an under layer formed on a substrate formed of at least one metal element selected from the group consisting of Cu, Rh, Pd, Ag, W, Ir, Pt and Au, and a magneto-optical recording layer having a multi layered structure formed by alternately stacking layers formed of Co, and layers formed of Pt and/or Pd, said magneto-optical recording layer having a total thickness between 50 and 800 Å.
Claim 9
Dependent Claim
74 words
A magneto-optical recording medium comprising a substrate, an under layer formed on a substrate formed of at least one metal element selected from the group consisting of Cu, Rh, Pd, Ag, W, Ir, Pt and Au, and a magneto-optical recording layer having a multi layered structure formed by alternately stacking layers formed of Co, and layers formed of Pt and/or Pd, said magneto-optical recording layer having a total thickness between 50 and 800 Å.
Claim 10
Dependent Claim
20 words
A magneto-optical recording medium according to claim 7, wherein said under layer has a thickness between 5 and 5000 Å.
Claim 11
Dependent Claim
20 words
A magneto-optical recording medium according to claim 8, wherein said under layer has a thickness between 5 and 500 Å.
Claim 12
Dependent Claim
63 words
A magneto-optical recoding medium comprising a substrate, a dielectric under layer formed on said substrate, and a magneto-optical recording layer formed on said dielectric under layer, said magneto-optical recording layer having a multi layered structure formed by alternately stacking layers formed of Co and layers formed of Pt and/or Pd, said magneto-optical recording layer having a total thickness between 50 and 800 Å.
Claim 13
Dependent Claim
63 words
A magneto-optical recoding medium comprising a substrate, a dielectric under layer formed on said substrate, and a magneto-optical recording layer formed on said dielectric under layer, said magneto-optical recording layer having a multi layered structure formed by alternately stacking layers formed of Co and layers formed of Pt and/or Pd, said magneto-optical recording layer having a total thickness between 50 and 800 Å.
Claim 14
Dependent Claim
32 words
A magneto-optical recording medium according to claim 10, said dielectric under layer is one of Al₂O₃, Ta₂O₅, MgO, SiO₂, TiO₂, Fe₂O₃, ZrO₂, Bi₂O₃, ZrN, TiN, Si₃N₄, AlN, AlSiN, BN, TaN and NbN.
Claim 15
Dependent Claim
19 words
A magneto-optical recording medium according to claim 10, further comprises a dielectric layer formed an said magneto-optical recording layer.
Claim 16
Dependent Claim
25 words
A magneto-optical recording medium according to claim 10, further comprises a metal under layer interposed between said dielectric under layer and said magneto-optical recording layer.
Claim 17
Dependent Claim
23 words
A magneto-optical recording medium according to claim 1, 7 or 10, further comprises a metal reflectional layer formed on said magneto-optical recording layer.
References Cited (Backward Citations)
No citation records indexed.
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