US4719154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto-optic recording element with amorphous aluminum-nitrogen alloy layer
Assignee: Eastman Kodak Co
•
Filing: 1986-09-17
•
Granted: 1988-01-12
•
Expires: 2006-09-17
Abstract
Abstract Disclosed herein is a novel magneto-optical recording element comprising an alloy thin film of aluminum and nitrogen, such film being contiguous with a magneto-optic recording layer. The Al 1-x -N x alloy is distinct from the stoichiometric AlN compound used in prior art in that it is substantially amorphous in character. The amorphous character of this alloy film gives rise to a substantially enhanced (8×) magneto-optic effect, as well as excellent corrosion resistance. Also disclosed is a reactive sputtering method for producing such amorphous aluminum-nitrogen alloy films.
Inventors
- 👤 Tukaram K. Hatwar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:43
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
55 words
A magneto-optic recording element of the type comprising a magneto-optic layer disposd on a substrate, said layer having a contiguous overlayer of an aluminum-nitrogen alloy, characterized in that said alloy overlayer is amorphous, and in that the stoichiometry of the aluminum-nitrogen alloy is Al 1-x N x where x is between about 0.30 to 0.45.
Claim 2
Dependent Claim
55 words
A magneto-optic recording element of the type comprising a magneto-optic layer disposd on a substrate, said layer having a contiguous overlayer of an aluminum-nitrogen alloy, characterized in that said alloy overlayer is amorphous, and in that the stoichiometry of the aluminum-nitrogen alloy is Al 1-x N x where x is between about 0.30 to 0.45.
Claim 3
Dependent Claim
19 words
The recording element of claim 1 wherein said magneto-optic layer comprises an alloy of rare earth and transition metals.
Claim 4
Dependent Claim
15 words
The recording element of claim 1 wherein said magneto-optic layer comprises an amorphous Tb-Fe-Co alloy.
Claim 5
Dependent Claim
63 words
A magneto-optic recording element comprising a substrate, a first amorphous layer of an aluminum-nitrogen alloy disposed on said substrate, a magneto-optic layer disposed on said first amorphous layer, and a second amorphous layer of an aluminum-nitrogen alloy disposed on said magneto-optic layer, said first and second layers, having a stoichiometry, Al 1-x N x , where x is between about 0.30 and 0.45.
Claim 6
Dependent Claim
63 words
A magneto-optic recording element comprising a substrate, a first amorphous layer of an aluminum-nitrogen alloy disposed on said substrate, a magneto-optic layer disposed on said first amorphous layer, and a second amorphous layer of an aluminum-nitrogen alloy disposed on said magneto-optic layer, said first and second layers, having a stoichiometry, Al 1-x N x , where x is between about 0.30 and 0.45.
Claim 7
Dependent Claim
19 words
The recording element of claim 4 wherein said magneto-optic layer comprises an alloy of rare earth and transition metals.
Claim 8
Dependent Claim
19 words
The recording element of claim 4 wherein said magneto-optic layer comprises an amorphous alloy of terbium, iron and cobalt.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |