EP0161807A1
Expired / Lapsed
EP
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Magneto-optic memory element
Assignee: Sharp Corp
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Filing: 1985-04-12
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Granted: —
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Expires: 2005-04-12
Abstract
Abstract A magneto-optic memory element includes a GdTbFe recording layer (16) sandwiched between a pair of transparent AIN dielectric layers (12, 14). At least one of the pair of transparent AIN dielectric layers is extended to have a size larger than the GdTbFe recording layer so as to cover the periphery edge of the GdTbFe recording layer, thereby protecting the GdTbFe recording layer from the oxygen and moisture. An Al-Ni alloy reflection film (18) is formed on one of the pair of transparent AIN dielectric layers in order to increase the apparent Kerr rotation angle produced by the magneto-optic memory element.
Inventors
- 👤 Kenji Ohta
- 👤 Akira Takahashi
- 👤 Hiroyuki Katayama
- 👤 Junji Hirogane
- 👤 Yoshiteru Murakami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 12:41
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B11/10589; G11B11/10593; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/22; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A magneto-optic memory element comprising: a transparent substrate; a first transparent oxygen-proof, moisture-proof dielectric layer formed on said transparent substrate; an alloy thin-film magneto-optic recording layer formed on said transparent oxygen-proof, moisture-proof dielectric layer; a second transparent oxygen-proof, moisture-proof dielectric layer formed on said alloy thin-film magneto-optic recording layer; '.a reflection layer formed on said second transparent oxygen-proof, moisture-proof dielectric layer; and an oxygen-proof, moisture-proof protective film disposed on the periphery edge of said alloy thin-film magneto-optic recording layer.
Claim 2
Dependent Claim
79 words
A magneto-optic memory element comprising: a transparent substrate; a first transparent oxygen-proof, moisture-proof dielectric layer formed on said transparent substrate; an alloy thin-film magneto-optic recording layer formed on said transparent oxygen-proof, moisture-proof dielectric layer; a second transparent oxygen-proof, moisture-proof dielectric layer formed on said alloy thin-film magneto-optic recording layer; '.a reflection layer formed on said second transparent oxygen-proof, moisture-proof dielectric layer; and an oxygen-proof, moisture-proof protective film disposed on the periphery edge of said alloy thin-film magneto-optic recording layer.
Claim 3
Dependent Claim
59 words
The magneto-optic memory element of claim 1, wherein at least one of said first and second transparent oxygen-proof, moisture-proof dielectric layers is extended to have a size lager than said alloy thin-film magneto-optic recording layer, the extended portion following said periphery edge of said alloy thin-film magneto-optic recording layer so as to function as said oxygen-proof, moisture-proof protective film.
Claim 4
Dependent Claim
35 words
The magneto-optic memory element of claim 1, wherein said reflection layer is an aluminum (Al) reflection layer to which an element which prevents the formation of turbidity in the aluminum (Al) reflection layer is added.
Claim 5
Dependent Claim
16 words
The magneto-optic memory element of claim 1, wherein said reflection layer is an Al-Ni alloy film.
Claim 6
Dependent Claim
30 words
The magneto-optic memory element of claim 4, wherein said Al-Ni alloy film is formed by a sputtering method with a target of aluminum (Al) to which nickel (Ni) is added.
Claim 7
Dependent Claim
87 words
A magneto-optical memory element comprising a substrate (10), a magneto-optical recording layer (16) mounted on the substrate (10), a first dielectric layer (12) between the substrate and the recording layer and a second dielectric layer (14) on the side of the recording layer remote from the substrate, the first and second dielectric layers protecting their respective sides of the recording layer (16) from oxygen and moisture, characterised in that there is an oxygen and moisture protective layer (140) around the peripheral edge (160) of the recording medium.
Claim 8
Dependent Claim
87 words
A magneto-optical memory element comprising a substrate (10), a magneto-optical recording layer (16) mounted on the substrate (10), a first dielectric layer (12) between the substrate and the recording layer and a second dielectric layer (14) on the side of the recording layer remote from the substrate, the first and second dielectric layers protecting their respective sides of the recording layer (16) from oxygen and moisture, characterised in that there is an oxygen and moisture protective layer (140) around the peripheral edge (160) of the recording medium.
References Cited (Backward Citations)
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