Patent USRE38474E1 successfully refreshed from Google Patents.
USRE38474E1
Expired / Lapsed
US
⏱️ 0.0 years remaining
CoCrPtB alloys with increased boron content and method of producing same
Assignee: Western Digital Technologies Inc
•
Filing: 2002-08-27
•
Granted: 2004-03-23
•
Expires: 2022-08-27
Abstract
Abstract A magnetic layer structure with a layer of cobalt-chromium-platinum-boron composite alloy containing 10% to 20% B in the magnetic layer. The useful magnetic properties of the magnetic layer structure are achieved by the incorporation of a nucleation layer prior to the deposition of the magnetic layer. The resultant magnetic layer structures have coercivity H c values in between 2,000 and 5,000 Oe, grain sizes between 30 and 200 Angstroms and anisotropic crystallographic orientation with the c-axis of the cobalt-chromium-platinum-boron in the plane of the medium. These magnetic layer structures are suitable for magnetic data storage devices including magnetic disks.
Inventors
- 👤 David T. Margulies
- 👤 Ernesto E. Marinero
- 👤 Hal J. Rosen
- 👤 Brian R. York
- 👤 Kurt A. Rubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:12
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/65; G11B5/657; G11B5/73; G11B5/7368; G11B5/7369; G11B5/737; G11B5/739; G11B5/73911; G11B5/73913; G11B5/73917; G11B5/73919; G11B5/73921; G11B5/84; G11B5/851; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
58 words
A magnetic recording medium comprising a magnetic layer 10 to 50 5 to 500 Angstroms thick, said magnetic layer comprising a Co alloy comprising Cr x , Pt y , and B z wherein 0≦x≦30, 0≦y≦40 and 10≦z≦25 10 <z≦ 25 atomic percent, and 25≦(x+y+z)≦60, said magnetic layer having a coercivity value ranging between 2000 and 5000 Oe.
Claim 2
Dependent Claim
58 words
A magnetic recording medium comprising a magnetic layer 10 to 50 5 to 500 Angstroms thick, said magnetic layer comprising a Co alloy comprising Cr x , Pt y , and B z wherein 0≦x≦30, 0≦y≦40 and 10≦z≦25 10 <z≦ 25 atomic percent, and 25≦(x+y+z)≦60, said magnetic layer having a coercivity value ranging between 2000 and 5000 Oe.
Claim 3
Dependent Claim
18 words
The medium of claim 1 wherein said magnetic layer is a magnetic layer in a multi-layer magnetic structure.
Claim 4
Dependent Claim
81 words
A magnetic recording medium comprising: a) a substrate; b) a metal under-layer on said substrate said, under-layer having a body-centered-cubic lattice structure; c) a Co alloy nucleation layer deposited on said under-layer wherein said Co alloy nucleation layer is 1 to 50 Angstroms thick; d) a magnetic layer deposited on said Co alloy nucleation layer, said magnetic layer comprising a Co alloy comprising Cr x , Pt y , and B z wherein 0≦x≦30, 0≦y≦40 and 10≦z≦25 atomic percent, and 25≦(x+y+z)≦60.
Claim 5
Dependent Claim
81 words
A magnetic recording medium comprising: a) a substrate; b) a metal under-layer on said substrate said, under-layer having a body-centered-cubic lattice structure; c) a Co alloy nucleation layer deposited on said under-layer wherein said Co alloy nucleation layer is 1 to 50 Angstroms thick; d) a magnetic layer deposited on said Co alloy nucleation layer, said magnetic layer comprising a Co alloy comprising Cr x , Pt y , and B z wherein 0≦x≦30, 0≦y≦40 and 10≦z≦25 atomic percent, and 25≦(x+y+z)≦60.
Claim 6
Dependent Claim
26 words
The medium of claim 3 wherein said substrate is selected from the group consisting aluminum with a plated nickel phosphorus coating, glass, silicon, ceramic and quartz.
Claim 7
Dependent Claim
13 words
The medium of claim 3 wherein said media substrate is a disk substrate.
Claim 8
Dependent Claim
22 words
The medium of claim 3 wherein said under-layer is selected from the group consisting of chromium, ruthenium, chromium alloy and ruthenium alloy.
Claim 9
Dependent Claim
14 words
The medium of claim 6 wherein said under-layer has a substantially crystallographic [100] orientation.
Claim 10
Dependent Claim
14 words
The medium of claim 6 wherein said under-layer has a substantially crystallographic [110] orientation.
Claim 11
Dependent Claim
25 words
The medium of claim 6 wherein said under-layer is deposited by a process selected from the group consisting of sputtering, ion-beam deposition and laser deposition.
Claim 12
Dependent Claim
30 words
The medium of claim 3 wherein said Co alloy nucleation layer is comprised of CoCr x Pt y B z , wherein 15≦x≦40, 0≦y≦15 and 0≦z≦10 atomic percent, and 25≦(x+y+z)≦50.
Claim 13
Dependent Claim
18 words
The medium of claim 10 wherein said magnetic layer contains grain sizes ranging from 20 to 200 Angstroms.
Claim 14
Dependent Claim
18 words
The medium of claim 11 wherein said magnetic layer has a thickness ranging from 5 to 500 Angstroms.
Claim 15
Dependent Claim
26 words
The medium of claim 12 wherein said magnetic layer is deposited by a process selected from the group consisting of sputtering, ion-beam deposition and laser deposition.
Claim 16
Dependent Claim
18 words
The medium of claim 6 wherein said medium has a coercivity value ranging between 2000 and 5000 Oe.
Claim 17
Independent Claim
97 words
A method for making a magnetic storage medium comprising: a) providing a substrate; b) depositing on said substrate an under-layer selected from the group consisting of chromium, ruthenium, chromium alloy and ruthenium alloy; c) depositing on said under-layer a nucleation layer comprising a Co alloy comprising Cr x , Pt y , and B z wherein 15≦x≦40, 0≦y≦15 and 0≦z≦10 atomic percent, and 25≦(x+y+z)≦50; d) and depositing on said nucleation layer a magnetic layer comprising a Co alloy comprising Cr z , Pt y , and B z wherein 0≦x≦30, 0≦y≦40 and 10≦z≦25 atomic percent, and 25≦(x+y+z)≦60.
Claim 18
Independent Claim
97 words
A method for making a magnetic storage medium comprising: a) providing a substrate; b) depositing on said substrate an under-layer selected from the group consisting of chromium, ruthenium, chromium alloy and ruthenium alloy; c) depositing on said under-layer a nucleation layer comprising a Co alloy comprising Cr x , Pt y , and B z wherein 15≦x≦40, 0≦y≦15 and 0≦z≦10 atomic percent, and 25≦(x+y+z)≦50; d) and depositing on said nucleation layer a magnetic layer comprising a Co alloy comprising Cr z , Pt y , and B z wherein 0≦x≦30, 0≦y≦40 and 10≦z≦25 atomic percent, and 25≦(x+y+z)≦60.
Claim 19
Dependent Claim
31 words
The method of claim 15 wherein providing said substrate comprises providing a substrate selected from the group consisting of aluminum with a plated nickel phosphorus coating, glass, silicon, ceramic and quartz.
Claim 20
Dependent Claim
20 words
The method of claim 15 wherein said nucleation layer is deposited to a thickness ranging from 1 to 100 Angstroms.
Claim 21
Dependent Claim
26 words
The method of claim 15 wherein said nucleation layer is deposited by a process selected from the group consisting of sputtering, ion-beam deposition and laser deposition.
Claim 22
Dependent Claim
20 words
The method of claim 15 wherein said magnetic layer is deposited to a thickness ranging from 5 to 500 Angstroms.
Claim 23
Dependent Claim
26 words
The method of claim 15 wherein said magnetic layer is deposited by a process selected from the group consisting of sputtering, ion-beam deposition and laser deposition.
Claim 24
Dependent Claim
18 words
The method of claim 15 wherein depositing said under-layer includes applying a negative electrical bias to said substrate.
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) | 2007-03-23 | 2007-09-22 | 2008-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-03-23 | 2011-09-22 | 2012-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-03-23 | 2015-09-22 | 2016-03-23 | $7700.00 | Window Closed / Lapsed |