US5153044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic disk for longitudinal recording comprising an amorphous intermediate layer
Assignee: WD Media LLC
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Filing: 1991-10-21
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Granted: 1992-10-06
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Expires: 2011-10-21
Abstract
Abstract A method for manufacturing a disk includes the step of forming a first nickel-phosphorus alloy layer on an aluminum substrate, e.g., by electroless plating. A second nickel-phosphorus layer is then sputtered onto the first nickel-phosphorus layer, and a magnetic alloy is sputtered onto the second nickel-phosphorus layer. The magnetic alloy is typically sputtered immediately after the second nickel-phosphorus layer is formed without removing the disk from the sputtering apparatus between the time the second nickel-phosphorus layer is formed and the time the magnetic alloy is formed. Because of this, contaminants are not capable of lodging on or affecting the surface of the disk prior to formation of the magnetic alloy. The second nickel-phosphorus layer is typically amorphous and therefore masks any nonuniformities in the surface of the first nickel-phosphorus layer. Because of this, the second nickel-phosphorus layer serves as a uniform nucleation surface for forming the magnetic alloy, and thus the magnetic alloy exhibits uniform magnetic characteristics.
Inventors
- 👤 Tu Chen
- 👤 Tsutomu T. Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:09
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/62; G11B5/73; G11B5/7368; G11B5/7369; G11B5/7371; G11B5/739; G11B5/73911; G11B5/73913; G11B5/73917; G11B5/73919; G11B5/73921; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12931; Y10T428/12944
Claims Analysis
Total Claims: 51
Claim 1
Independent Claim
145 words
A method for manufacturing a film of magnetic recording media comprising the steps of: providing a substrate; forming a first layer on said substrate by vacuum deposition, said first layer comprising nickel, said first layer also comprising at least one other element selected from the group consisting of B, Al, Ga, In, C, Si, Ge, Sn, Pb, As, Sb, Bi, S, Se, and Te, said first layer being amorphous or substantially amorphous; and forming a single layer of magnetic recording media directly on said first layer said media comprising an alloy having an intrinsic coercivity greater than about 600 Oe, wherein the easy axis of magnetization of said alloy is oriented preferentially in a direction generally parallel to said layer of magnetic recording media or is substantially isotropic, wherein the structure resulting from said method contains only one magnetic layer formed on said first layer.
Claim 2
Independent Claim
145 words
A method for manufacturing a film of magnetic recording media comprising the steps of: providing a substrate; forming a first layer on said substrate by vacuum deposition, said first layer comprising nickel, said first layer also comprising at least one other element selected from the group consisting of B, Al, Ga, In, C, Si, Ge, Sn, Pb, As, Sb, Bi, S, Se, and Te, said first layer being amorphous or substantially amorphous; and forming a single layer of magnetic recording media directly on said first layer said media comprising an alloy having an intrinsic coercivity greater than about 600 Oe, wherein the easy axis of magnetization of said alloy is oriented preferentially in a direction generally parallel to said layer of magnetic recording media or is substantially isotropic, wherein the structure resulting from said method contains only one magnetic layer formed on said first layer.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein said media is an alloy comprising cobalt and platinum.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein said substrate comprises a material selected from the group consisting of glass, ceramic, aluminum, and nickel-phosphorus plated aluminum.
Claim 5
Dependent Claim
10 words
The method of claim 1 wherein said substrate is tape.
Claim 6
Dependent Claim
17 words
The method of claim 1 further comprising the step of forming a protective overcoat over said media.
Claim 7
Dependent Claim
31 words
The method of claim 5 wherein said protective overcoat is a material selected from the group consisting of sputtered carbon, ZrO 2 , SiO 2 , TiO 2 , and TaO.
Claim 8
Dependent Claim
25 words
Method of claim 1 wherein said media is constructed so that data can be recorded in and read from said media with a read-write head.
Claim 9
Dependent Claim
20 words
Method claim 1 further comprising the step of plating an underlayer onto said substrate prior to forming said first layer.
Claim 10
Dependent Claim
13 words
Method of claim 1 wherein said at least one other element is boron.
Claim 11
Dependent Claim
16 words
Method of claim 1, wherein said structure resulting from said method is a hard magnetic disk.
Claim 12
Independent Claim
121 words
A method for manufacturing a film of magnetic recording media comprising the steps of: providing a substrate; forming a first layer comprising nickel over said substrate, said first layer being amorphous or substantially amorphous; and forming a single layer of magnetic recording media directly on said first layer, said first layer serving to reduce the amount of bit shift exhibited by said media, said media comprising an alloy having a coercivity greater than about 600 Oe, wherein the easy axis of magnetization of said alloy is oriented preferentially in a direction generally parallel to said layer of magnetic recording media or is substantially isotropic, wherein the structure resulting from said method contains only one magnetic layer formed on said first layer.
Claim 13
Independent Claim
121 words
A method for manufacturing a film of magnetic recording media comprising the steps of: providing a substrate; forming a first layer comprising nickel over said substrate, said first layer being amorphous or substantially amorphous; and forming a single layer of magnetic recording media directly on said first layer, said first layer serving to reduce the amount of bit shift exhibited by said media, said media comprising an alloy having a coercivity greater than about 600 Oe, wherein the easy axis of magnetization of said alloy is oriented preferentially in a direction generally parallel to said layer of magnetic recording media or is substantially isotropic, wherein the structure resulting from said method contains only one magnetic layer formed on said first layer.
Claim 14
Dependent Claim
35 words
The method of claim 11 wherein the amount of bit shift in 1 bit in 10 9 bits exhibited by said media is reduced by at least about 1 ns by forming said first layer.
Claim 15
Dependent Claim
25 words
Method of claim 11 wherein said media is constructed so that data can be recorded in and read from said media with a read-write head.
Claim 16
Dependent Claim
21 words
Method of claim 11 further comprising the step of plating an underlayer onto said substrate prior to forming said first layer.
Claim 17
Dependent Claim
16 words
Method of claim 11, wherein said structure resulting from said method is a hard magnetic disk.
Claim 18
Dependent Claim
97 words
A structure comprising: a substrate; a first layer formed on said substrate by vacuum deposition, said first layer comprising nickel and at least one element selected from the group consisting of B, Al, Ga, In, C, Si, Ge, Sn, Pb, As, Sb, Bi, S, Se, and Te, said first layer being amorphous or substantially amorphous; and magnetic recording media formed directly on said first layer, said media comprising an alloy having a coercivity greater than about 600 Oe, the magnetic domains within said alloy having a magnetization direction generally in the plane of said magnetic recording media.
Claim 19
Dependent Claim
97 words
A structure comprising: a substrate; a first layer formed on said substrate by vacuum deposition, said first layer comprising nickel and at least one element selected from the group consisting of B, Al, Ga, In, C, Si, Ge, Sn, Pb, As, Sb, Bi, S, Se, and Te, said first layer being amorphous or substantially amorphous; and magnetic recording media formed directly on said first layer, said media comprising an alloy having a coercivity greater than about 600 Oe, the magnetic domains within said alloy having a magnetization direction generally in the plane of said magnetic recording media.
Claim 20
Dependent Claim
13 words
The structure of claim 16 further comprising a protective overcoat over said media.
Claim 21
Dependent Claim
25 words
Structure of claim 16 wherein said media is constructed so that data can be recorded in and read from said media with a read-write head.
Claim 22
Dependent Claim
16 words
Structure of claim 16 further comprising a plated underlayer between said substrate and said first layer.
Claim 23
Dependent Claim
13 words
Structure of claim 16 wherein said at least one other element is boron.
Claim 24
Dependent Claim
89 words
A structure comprising: a substrate; a first layer comprising nickel formed on said substrate, said first layer being amorphous or substantially amorphous; and a layer of magnetic recording media formed directly on said first layer, said first layer causing said media to exhibit less bit shift than if said first layer had not been formed, said media comprising an alloy having a coercivity greater than about 600 Oe, the magnetic domains within said alloy having a magnetization direction generally in the plane of said layer of magnetic recording media.
Claim 25
Dependent Claim
89 words
A structure comprising: a substrate; a first layer comprising nickel formed on said substrate, said first layer being amorphous or substantially amorphous; and a layer of magnetic recording media formed directly on said first layer, said first layer causing said media to exhibit less bit shift than if said first layer had not been formed, said media comprising an alloy having a coercivity greater than about 600 Oe, the magnetic domains within said alloy having a magnetization direction generally in the plane of said layer of magnetic recording media.
Claim 26
Dependent Claim
30 words
The structure of claim 21 wherein said media exhibits at least about 1 ns less bit shift with said first layer present than if said fist layer was not present.
Claim 27
Dependent Claim
13 words
The structure of claim 22 further comprising a protective overcoat over said media.
Claim 28
Dependent Claim
25 words
Structure of claim 21 wherein said media is constructed so that data can be recorded in and read from said media with a read-write head.
Claim 29
Dependent Claim
16 words
Structure of claim 21 further comprising a plated underlayer between said substrate and said first layer.
Claim 30
Independent Claim
149 words
A method for manufacturing a film of magnetic recording media such that data may be read from or written to said media with a read-write head, said method comprising the steps of: providing a substrate; forming a first layer on said substrate by vacuum deposition, said first layer comprising nickel, said first layer also comprising at least one other element selected from the group consisting of B, Al, Ga, In, C, Si, Ge, Sn, Pb, As, Sb, Bi, S, Se, and Te, said first layer being amorphous or substantially amorphous; and forming a single layer of magnetic recording media directly on said first layer, wherein the easy axis of magnetization of said media is oriented preferentially in a direction generally parallel to said layer of magnetic recording media or is substantially isotropic, wherein the structure resulting from said method contains only one magnetic layer formed on said first layer.
Claim 31
Independent Claim
149 words
A method for manufacturing a film of magnetic recording media such that data may be read from or written to said media with a read-write head, said method comprising the steps of: providing a substrate; forming a first layer on said substrate by vacuum deposition, said first layer comprising nickel, said first layer also comprising at least one other element selected from the group consisting of B, Al, Ga, In, C, Si, Ge, Sn, Pb, As, Sb, Bi, S, Se, and Te, said first layer being amorphous or substantially amorphous; and forming a single layer of magnetic recording media directly on said first layer, wherein the easy axis of magnetization of said media is oriented preferentially in a direction generally parallel to said layer of magnetic recording media or is substantially isotropic, wherein the structure resulting from said method contains only one magnetic layer formed on said first layer.
Claim 32
Dependent Claim
21 words
Method of claim 26 further comprising the step of plating a mechanical support layer between said substrate and said first layer.
Claim 33
Dependent Claim
13 words
Method of claim 27 wherein said at least one other element is boron.
Claim 34
Dependent Claim
16 words
Method of claim 26, wherein said structure resulting from said method is a hard magnetic disk.
Claim 35
Independent Claim
126 words
A method for manufacturing a film of magnetic recording media such that data may be read from or written to said media with a read-write head, said method comprising the steps of: providing a substrate; forming a first layer comprising nickel over said substrate, said first layer being amorphous or substantially amorphous; and forming a single layer of magnetic recording media directly on said first layer, said first layer serving to reduce the amount of bit shift exhibited by said media, wherein the easy axis of magnetization of said media is oriented preferentially in a direction generally parallel to said layer of magnetic recording media or is substantially isotropic, wherein the structure resulting from said method contains only one magnetic layer formed on said first layer.
Claim 36
Independent Claim
126 words
A method for manufacturing a film of magnetic recording media such that data may be read from or written to said media with a read-write head, said method comprising the steps of: providing a substrate; forming a first layer comprising nickel over said substrate, said first layer being amorphous or substantially amorphous; and forming a single layer of magnetic recording media directly on said first layer, said first layer serving to reduce the amount of bit shift exhibited by said media, wherein the easy axis of magnetization of said media is oriented preferentially in a direction generally parallel to said layer of magnetic recording media or is substantially isotropic, wherein the structure resulting from said method contains only one magnetic layer formed on said first layer.
Claim 37
Dependent Claim
20 words
Method of claim 30 further comprising the step of plating mechanical support layer between said substrate and said first layer.
Claim 38
Dependent Claim
16 words
Method of claim 30, wherein said structure resulting from said method is a hard magnetic disk.
Claim 39
Dependent Claim
111 words
A structure comprising: a substrate; a first layer formed on said substrate by vacuum deposition, said first layer comprising nickel and at least one element selected from the group consisting of B, Al, Ga, In, C, Si, Ge, Sn, Pb, As, Sb, Bi, S, Se, and Te, said first layer being amorphous or substantially amorphous; and a single layer of magnetic recording media formed directly on said first layer such that data may be read from or written to said media with a read-write head, wherein the easy axis of magnetization of said media is oriented preferentially in a direction generally parallel to said magnetic recording media or is substantially isotropic.
Claim 40
Dependent Claim
111 words
A structure comprising: a substrate; a first layer formed on said substrate by vacuum deposition, said first layer comprising nickel and at least one element selected from the group consisting of B, Al, Ga, In, C, Si, Ge, Sn, Pb, As, Sb, Bi, S, Se, and Te, said first layer being amorphous or substantially amorphous; and a single layer of magnetic recording media formed directly on said first layer such that data may be read from or written to said media with a read-write head, wherein the easy axis of magnetization of said media is oriented preferentially in a direction generally parallel to said magnetic recording media or is substantially isotropic.
Claim 41
Dependent Claim
20 words
Structure of claim 33 further comprising a mechanical support layer plated onto said substrate and formed underneath said first layer.
Claim 42
Dependent Claim
12 words
Structure of claim 33 wherein said at least one element is boron.
Claim 43
Dependent Claim
12 words
Structure of claim 33, wherein said structure is a hard magnetic disk.
Claim 44
Dependent Claim
100 words
A structure comprising: a substrate; a first layer comprising nickel formed on said substrate, said first layer being amorphous or substantially amorphous; and a single layer of magnetic recording media formed directly on said first layer, said first layer causing said media to exhibit less bit shift than if said first layer had not been formed, and wherein data may be written to or read from said media with a read-write head wherein the easy axis of magnetization of said media is oriented preferentially in a direction generally parallel to said layer of magnetic recording media or is substantially isotropic.
Claim 45
Dependent Claim
100 words
A structure comprising: a substrate; a first layer comprising nickel formed on said substrate, said first layer being amorphous or substantially amorphous; and a single layer of magnetic recording media formed directly on said first layer, said first layer causing said media to exhibit less bit shift than if said first layer had not been formed, and wherein data may be written to or read from said media with a read-write head wherein the easy axis of magnetization of said media is oriented preferentially in a direction generally parallel to said layer of magnetic recording media or is substantially isotropic.
Claim 46
Dependent Claim
20 words
Structure of claim 37 further comprising a mechanical support layer plated onto said substrate and formed underneath said first layer.
Claim 47
Dependent Claim
12 words
Structure of claim 37, wherein said structure is a hard magnetic disk.
Claim 48
Dependent Claim
98 words
A structure comprising: a substrate; a first layer formed on said substrate by vacuum deposition, said first layer comprising nickel and at least one element selected from the group consisting of B, Al, Ga In, C, Si, Ge, Sn, Pb, As, Sb, Bi, S, Se, and Te, said first layer being amorphous or substantially amorphous; and magnetic recording media formed directly on said first layer such that data may be read from or written to said media with a read-write head, the magnetic domains within said media having a magnetization direction generally in the plane of said media.
Claim 49
Dependent Claim
98 words
A structure comprising: a substrate; a first layer formed on said substrate by vacuum deposition, said first layer comprising nickel and at least one element selected from the group consisting of B, Al, Ga In, C, Si, Ge, Sn, Pb, As, Sb, Bi, S, Se, and Te, said first layer being amorphous or substantially amorphous; and magnetic recording media formed directly on said first layer such that data may be read from or written to said media with a read-write head, the magnetic domains within said media having a magnetization direction generally in the plane of said media.
Claim 50
Dependent Claim
91 words
A structure comprising: a substrate; a first layer comprising nickel formed on said substrate, said first layer being amorphous or substantially amorphous; and a layer of magnetic recording media formed directly on said first layer, said first layer causing said media to exhibit less bit shift than if said first layer had not been formed, and wherein data may be written to or read from said media with a read-write head, the magnetic domains within said media having a direction generally in the plane of said layer of magnetic recording media.
Claim 51
Dependent Claim
91 words
A structure comprising: a substrate; a first layer comprising nickel formed on said substrate, said first layer being amorphous or substantially amorphous; and a layer of magnetic recording media formed directly on said first layer, said first layer causing said media to exhibit less bit shift than if said first layer had not been formed, and wherein data may be written to or read from said media with a read-write head, the magnetic domains within said media having a direction generally in the plane of said layer of magnetic recording media.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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