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US4287544A
Expired / Lapsed
US
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Magnetic data carrier for perpendicular recording
Assignee: Compagnie Internationale pour l'Informatique CII-Honeywell Bull SA
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Filing: 1979-01-02
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Granted: 1981-09-01
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Expires: 1999-01-02
Abstract
Abstract A carrier for magnetic data recorded therein by perpendicular recording comprises a non-magnetic substrate having at least one substantially plane surface provided with a magnetic data layer of an anisotropic magnetic material having its axis of easy magnetization perpendicular to the said plane surface, and includes an additional layer of an anisotropic magnetic material whose axis of hard magnetization is parallel to the said plane surface. An intermediate non-magnetic, insulative coupling layer may be provided to maximize magneto-static coupling between the layers while minimizing energy exchanges therebetween. A further non-magnetic sub-layer may be provided directly on the plane surface of the substrate to assure good adhesion of the additional layer to the substrate and isolation thereof from the magnetic layer.
Inventors
- 👤 Jean-Pierre Lazzari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1278; G11B5/62; G11B5/64; G11B5/66; G11B5/676
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
161 words
A carrier adapted to have data recorded therein by perpendicular magnetic recording comprising a non-magnetic substrate having at least one plane surface and a plurality of magnetic layers on said substrate, said plurality of layers including a first magnetic data layer of anisotropic magnetic material for recording of data having its axis of easy magnetization perpendicular to the said surface and comprising, in the lengthwise direction, successive magnetic cells separated by transitions and an additional magnetic layer of anisotropic magnetic material having its axis of hard magnetization is parallel to the surface, said additional layer being disposed between the substrate and the said first layer, the plane of anisotropy of the first magnetic data layer being perpendicular to the said surface of the substrate, and the plane of anisotropy of the additional layer being parallel to the said surface such that the axis of hard magnetization of the additional layer is substantially parallel to the lengthwise direction of the data layer.
Claim 2
Dependent Claim
161 words
A carrier adapted to have data recorded therein by perpendicular magnetic recording comprising a non-magnetic substrate having at least one plane surface and a plurality of magnetic layers on said substrate, said plurality of layers including a first magnetic data layer of anisotropic magnetic material for recording of data having its axis of easy magnetization perpendicular to the said surface and comprising, in the lengthwise direction, successive magnetic cells separated by transitions and an additional magnetic layer of anisotropic magnetic material having its axis of hard magnetization is parallel to the surface, said additional layer being disposed between the substrate and the said first layer, the plane of anisotropy of the first magnetic data layer being perpendicular to the said surface of the substrate, and the plane of anisotropy of the additional layer being parallel to the said surface such that the axis of hard magnetization of the additional layer is substantially parallel to the lengthwise direction of the data layer.
Claim 3
Dependent Claim
22 words
A carrier according to claim 1 including a non-magnetic electrically insulating coupling layer between the magnetic data layer and the additional layer.
Claim 4
Dependent Claim
43 words
A carrier according to claim 2 including a sub-layer between the substrate and the additional layer, said sub-layer being a non-magnetic, electrically insulating material for ensuring good adhesion to the substrate while forming a diffusion barrier between the additional layer and the substrate.
Claim 5
Dependent Claim
44 words
A carrier according to claim 1 further including a sub-layer between the substrate and the additional layer, said sub-layer being a non-magnetic, electrically insulating material for ensuring good adhesion to the substrate while forming a diffusion barrier between the additional layer and the substrate.
Claim 6
Dependent Claim
44 words
A carrier according to claim 1 wherein the additional layer comprises an alternating stack of thin magnetic layers and thin non-magnetic layers, the anisotropy of the thin magnetic layers being parallel to the said surface and said thin magnetic layers being even in number.
Claim 7
Dependent Claim
20 words
A carrier according to claim 5 wherein the said thin magnetic layers comprise an alloy of iron, nickel and chrome.
Claim 8
Dependent Claim
22 words
A carrier according to claim 6 including a non-magnetic, electrically insulating coupling layer between the magnetic data layer and the additional layer.
Claim 9
Dependent Claim
44 words
A carrier according to claim 6 further including a sub-layer between the substrate and the additional layer, said sub-layer being a non-magnetic, electrically insulating material for ensuring good adhesion to the substrate while forming a diffusion barrier between the additional layer and the substrate.
Claim 10
Dependent Claim
19 words
A carrier according to claim 1 wherein the said additional layer comprises an alloy of iron, nickel and chrome.
Claim 11
Dependent Claim
22 words
A carrier according to claim 9 including a non-magnetic, electrically insulating coupling layer between the magnetic data layer and the additional layer.
Claim 12
Dependent Claim
44 words
A carrier according to claim 9 further including a sub-layer between the substrate and the additional layer, said sub-layer being a non-magnetic, electrically insulating material for ensuring good adhesion to the substrate while forming a diffusion barrier between the additional layer and the substrate.
Claim 13
Dependent Claim
20 words
A carrier according to claim 11 including an electrically insulating coupling layer between the first layer and the additional layer.
Claim 14
Dependent Claim
118 words
A carrier adapted to have data recorded therein by perpendicular magnetic recording comprising a non-magnetic substrate having at least one plane surface and a plurality of magnetic layers on said substrate, said plurality of layers including a first magnetic data layer of anisotropic magnetic material for recording of data having its axis of easy magnetization perpendicular to the said surface and an additional magnetic layer of anisotripic magnetic material having its axis of hard magnetization is parallel to the said surface, said additional layer comprising an alternating stack of thin magnetic layers and thin non-magnetic layers, the anisotropy of the thin magnetic layers being parallel to the said surface and said thin magnetic layers being even in number.
Claim 15
Dependent Claim
118 words
A carrier adapted to have data recorded therein by perpendicular magnetic recording comprising a non-magnetic substrate having at least one plane surface and a plurality of magnetic layers on said substrate, said plurality of layers including a first magnetic data layer of anisotropic magnetic material for recording of data having its axis of easy magnetization perpendicular to the said surface and an additional magnetic layer of anisotripic magnetic material having its axis of hard magnetization is parallel to the said surface, said additional layer comprising an alternating stack of thin magnetic layers and thin non-magnetic layers, the anisotropy of the thin magnetic layers being parallel to the said surface and said thin magnetic layers being even in number.
Claim 16
Dependent Claim
21 words
A carrier according to claim 13 wherein the said additional layer is disposed between the substrate and the said first layer.
Claim 17
Dependent Claim
58 words
A carrier according to claim 13 or 14 wherein the plane of anisotropy of the magnetic data layer is perpendicular to the said surface of the substrate, and the plae of anisotrophy of the additional layer is parallel to the said surface, the axis of hard magnetization being substantially parallel to the lengthwise direction of the data layer.
Claim 18
Dependent Claim
20 words
A carrier according to claim 13 wherein the said thin magnetic layers comprise an alloy of iron, nickel and chrome.
Claim 19
Dependent Claim
128 words
A carrier adapted to have data recorded therein by perpendicular magnetic recording comprising a non-magnetic substrate having at least one plane surface and a plurality of magnetic layers on said substrate, said plurality of layers including a first magnetic data layer of anisotropic magnetic material for recording data, said first layer having perpendicular anisotropy and its axis of easy magnetization perpendicular to the said surface and an additional magnetic layer of anisotropic magnetic material, said additional layer having parallel anisotropy and its axis of hard magnetization parallel to the said surface, said additional layer being disposed between the substrate and the said first layer and comprising an alternating stack of thin magnetic layers being parallel to the said surface and said thin magnetic layers being even in number.
Claim 20
Dependent Claim
128 words
A carrier adapted to have data recorded therein by perpendicular magnetic recording comprising a non-magnetic substrate having at least one plane surface and a plurality of magnetic layers on said substrate, said plurality of layers including a first magnetic data layer of anisotropic magnetic material for recording data, said first layer having perpendicular anisotropy and its axis of easy magnetization perpendicular to the said surface and an additional magnetic layer of anisotropic magnetic material, said additional layer having parallel anisotropy and its axis of hard magnetization parallel to the said surface, said additional layer being disposed between the substrate and the said first layer and comprising an alternating stack of thin magnetic layers being parallel to the said surface and said thin magnetic layers being even in number.
Claim 21
Dependent Claim
20 words
A carrier according to claim 17 wherein the said thin magnetic layers comprise an alloy of iron, nickel and chrome.
Claim 22
Dependent Claim
21 words
A carrier according to claim 18 including a non-magnetic, electrically insulating coupling layer between the first layer and the additional layer.
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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |