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Patent US5112701A successfully refreshed from Google Patents.
US5112701A
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Magneto-optic recording media and process for producing the same
Assignee: Ricoh Co Ltd
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Filing: 1989-03-23
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Granted: 1992-05-12
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Expires: 2009-03-23
Abstract
Abstract Magneto-optic recording media and production processes of the same in which a thin magnetic film comprising, as the main ingredient, nitrides of metal (Fe, Co and Ni) and having strong perpendicular magnetic anisotropy is formed directly or indirectly by way of a reflective layer on a non-magnetic support, providing that the reflective layer is formed on the thin magnetic film if the magnetic thin film is disposed directly on the non-magnetic support.
Inventors
- 👤 Tadao Katsuragawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:02
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10584; G11B11/10586; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
110 words
Magneto-optic recording media, comprising a thin magnetic film oriented along C-axis comprising nitrides represented by Fe x N wherein x is 2-3, said nitrides being present in an amount sufficient to result in the following properties: a Faraday rotational angle of not less than 0.3 deg/μm and a magnetic field with perpendicular magnetic anisotropy of not less than 5 KOe, a reflective layer and a non-magnetic support, said thin magnetic film being formed directly or indirectly by way of the reflective layer on the non-magnetic support, providing that said reflective layer is formed on the thin magnetic layer when said thin magnetic layer is directly disposed on the non-magnetic support.
Claim 2
Dependent Claim
110 words
Magneto-optic recording media, comprising a thin magnetic film oriented along C-axis comprising nitrides represented by Fe x N wherein x is 2-3, said nitrides being present in an amount sufficient to result in the following properties: a Faraday rotational angle of not less than 0.3 deg/μm and a magnetic field with perpendicular magnetic anisotropy of not less than 5 KOe, a reflective layer and a non-magnetic support, said thin magnetic film being formed directly or indirectly by way of the reflective layer on the non-magnetic support, providing that said reflective layer is formed on the thin magnetic layer when said thin magnetic layer is directly disposed on the non-magnetic support.
Claim 3
Dependent Claim
127 words
Magneto-optic recording media, comprising a thin magnetic film oriented along C-axis comprising nitrides represented by M x N wherein M represents at least one metal selected from the group consisting of Fe, Co and Ni and x is 2-3 said nitrides being present in an amount sufficient to result in the following properties: a Faraday rotational angle of not less than 0.3 deg/μm and a magnetic field with perpendicular magnetic anisotropy of not less than 4 KOe, a reflective layer and a non-magnetic support, said thin magnetic film being formed directly or indirectly by way of the reflective layer on the non-magnetic support, providing that said reflective layer is formed on the thin magnetic layer when said thin magnetic layer is directly disposed on the non-magnetic support.
Claim 4
Dependent Claim
127 words
Magneto-optic recording media, comprising a thin magnetic film oriented along C-axis comprising nitrides represented by M x N wherein M represents at least one metal selected from the group consisting of Fe, Co and Ni and x is 2-3 said nitrides being present in an amount sufficient to result in the following properties: a Faraday rotational angle of not less than 0.3 deg/μm and a magnetic field with perpendicular magnetic anisotropy of not less than 4 KOe, a reflective layer and a non-magnetic support, said thin magnetic film being formed directly or indirectly by way of the reflective layer on the non-magnetic support, providing that said reflective layer is formed on the thin magnetic layer when said thin magnetic layer is directly disposed on the non-magnetic support.
Claim 5
Dependent Claim
29 words
Magneto-optic recording media according to claim 2, wherein the thin magnetic film contains of at least one amorphous metal selected from the group consisting of Fe, Co and Ni.
Claim 6
Dependent Claim
29 words
Magneto-optic recording media according to claim 1, wherein the thin magnetic film contains of at least one amorphous metal selected from the group consisting of Fe, Co and Ni.
Claim 7
Dependent Claim
133 words
Magneto-optic recording media comprising a thin magnetic film oriented along C-axis comprising nitrides represented by M x N wherein M represents at least one metal selected from the group consisting of Fe, Co and Ni and x is 2-3 said nitrides being present in an amount sufficient to result in the following properties: a Faraday rotational angle of not less than 0.3 deg/μm and a magnetic field with perpendicular magnetic anisotropy of not less than 4 KOe, a thin amorphous film of rare earth-transition element alloy, a reflective layer and a non-magnetic support, said thin magnetic film being formed directly or indirectly by way of the reflective layer on the non-magnetic support, and said thin amorphous film of rare earth-transition element alloy being disposed between the thin magnetic film and the non-magnetic support.
Claim 8
Dependent Claim
133 words
Magneto-optic recording media comprising a thin magnetic film oriented along C-axis comprising nitrides represented by M x N wherein M represents at least one metal selected from the group consisting of Fe, Co and Ni and x is 2-3 said nitrides being present in an amount sufficient to result in the following properties: a Faraday rotational angle of not less than 0.3 deg/μm and a magnetic field with perpendicular magnetic anisotropy of not less than 4 KOe, a thin amorphous film of rare earth-transition element alloy, a reflective layer and a non-magnetic support, said thin magnetic film being formed directly or indirectly by way of the reflective layer on the non-magnetic support, and said thin amorphous film of rare earth-transition element alloy being disposed between the thin magnetic film and the non-magnetic support.
Claim 9
Dependent Claim
29 words
Magneto-optic recording media according to claim 5, wherein the thin magnetic film contains of at least one amorphous metal selected from the group consisting of Fe, Co and Ni.
Claim 10
Dependent Claim
116 words
Magneto-optic recording media comprising a thin magnetic film oriented along C-axis comprising nitrides represented by Fe x N wherein x is 2-3, said nitrides being present in an amount sufficient to result in the following properties: a Faraday rotational angle of not less than 0.3 deg/μm and a magnetic field with perpendicular magnetic anisotropy of not less than 5 KOe, a thin amorphous film of rare earth-transition element alloy, a reflective layer and a non-magnetic support, said thin magnetic film being formed directly or indirectly by way of the reflective layer on the non-magnetic support, and said thin amorphous film of rare earth-transition element alloy being disposed between the thin magnetic film and the non-magnetic support.
Claim 11
Dependent Claim
116 words
Magneto-optic recording media comprising a thin magnetic film oriented along C-axis comprising nitrides represented by Fe x N wherein x is 2-3, said nitrides being present in an amount sufficient to result in the following properties: a Faraday rotational angle of not less than 0.3 deg/μm and a magnetic field with perpendicular magnetic anisotropy of not less than 5 KOe, a thin amorphous film of rare earth-transition element alloy, a reflective layer and a non-magnetic support, said thin magnetic film being formed directly or indirectly by way of the reflective layer on the non-magnetic support, and said thin amorphous film of rare earth-transition element alloy being disposed between the thin magnetic film and the non-magnetic support.
Claim 12
Dependent Claim
29 words
Magneto-optic recording media according to claim 7, wherein the thin magnetic film contains of at least one amorphous metal selected from the group consisting of Fe, Co and Ni.
References Cited (Backward Citations)
US4271232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-12 | 1995-11-11 | 1996-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-12 | 1999-11-11 | 2000-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-12 | 2003-11-11 | 2004-05-12 | $7700.00 | Window Closed / Lapsed |