US5227211A
Expired / Lapsed
US
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Magnetic recording disk medium comprising a magnetic thin film and a carbon overcoat having surface nitrogen atoms, a specified carbon structure, and oxygen atoms
Assignee: WD Media LLC
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Filing: 1991-03-05
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Granted: 1993-07-13
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Expires: 2011-03-05
Abstract
Abstract A thin film magnetic disc having a carbon overcoat which is characterized by (a) a thickness of less than about 500 Å and (b) surface nitrogen atoms having a nitrogen (1s) electron principle binding energy, as determined by electron spectroscopy for chemical analysis (ESCA), of about 399.4 eV. The nitrogen atoms enhance lubricant adhesion to the overcoat. In a preferred embodiment, the overcoat is formed by sputtering under an argon/hydrocarbon/nitrogen gas atmosphere to produce long resistance-to-erosion times, and high lubricity properties.
Inventors
- 👤 Atef H. Eltoukhy
- 👤 Yassin Mehmandoust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:11
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/0605; C23C14/22; C23C14/54; G; G01; G01N; G01N3/00; G01N3/56; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12854; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/30; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
A thin film magnetic medium comprising a substrate disc, a magnetic thin-film formed on the substrate disc, and formed on the magnetic thin-film, a carbon overcoat having a thickness less than about 500 Å, and characterized by (i) a nitrogen (1s) electron principle binding energy, as determined by electron spectrosopy for chemical analysis (ESCA), of about 399.4 eV, and (ii) a carbon structure, characterized by a carbon (1s) principle binding energy of about 284.8 eV, and oxygen atoms having an oxygen (1s) principle binding energy of about 532.5 eV, also as determined by ESCA.
Claim 2
Dependent Claim
94 words
A thin film magnetic medium comprising a substrate disc, a magnetic thin-film formed on the substrate disc, and formed on the magnetic thin-film, a carbon overcoat having a thickness less than about 500 Å, and characterized by (i) a nitrogen (1s) electron principle binding energy, as determined by electron spectrosopy for chemical analysis (ESCA), of about 399.4 eV, and (ii) a carbon structure, characterized by a carbon (1s) principle binding energy of about 284.8 eV, and oxygen atoms having an oxygen (1s) principle binding energy of about 532.5 eV, also as determined by ESCA.
Claim 3
Dependent Claim
25 words
The medium of claim 1, wherein the carbon overcoat has an oxygen abundance of no more than about 10 atom percent, as determined by ESCA.
Claim 4
Dependent Claim
32 words
The medium of claim 2, wherein the carbon overcoat includes at least about 2 atom percent nitrogen atoms, and which further includes a layer of perfluoropolyether lubricant film on the carbon overcoat.
Claim 5
Dependent Claim
77 words
An article comprising a substrate; and formed on the substrate, a carbon overcoat having (i) surface nitrogen atoms characterized by a nitrogen (1s) electron principle binding energy, as determined by electron spectrosopy for chemical analysis (ESCA), of about 399.4 eV, and (ii) a carbon structure characterized by a carbon (1s) principle binding energy of about 284.8 eV, and (iii) oxygen atoms having an oxygen (1s) principle binding energy of about 532.5 eV, also as determined by ESCA.
Claim 6
Dependent Claim
77 words
An article comprising a substrate; and formed on the substrate, a carbon overcoat having (i) surface nitrogen atoms characterized by a nitrogen (1s) electron principle binding energy, as determined by electron spectrosopy for chemical analysis (ESCA), of about 399.4 eV, and (ii) a carbon structure characterized by a carbon (1s) principle binding energy of about 284.8 eV, and (iii) oxygen atoms having an oxygen (1s) principle binding energy of about 532.5 eV, also as determined by ESCA.
Claim 7
Dependent Claim
29 words
The article of claim 4, wherein the carbon overcoat has a thickness of less than about 500 Å, and contains at least about 2 atom percent surface nitrogen atoms.
Claim 8
Dependent Claim
21 words
The article of claim 4, wherein the carbon overcoat has an oxygen abundance of no more than about 10 atom percent.
Claim 9
Dependent Claim
18 words
The article of claim 6, which further includes a layer of perfluoropolyether lubricant film on the carbon overcoat.
Claim 10
Dependent Claim
17 words
The article of claim 7, wherein the lubricant film has a thickness of between about 15-40 Å.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |