US5453168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming protective overcoatings for metallic-film magnetic-recording mediums
Assignee: TULIP MEMORY SYSTEMS Inc A CA CORP
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Filing: 1993-08-25
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Granted: 1995-09-26
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Expires: 2013-08-25
Abstract
Abstract A sputter-deposited wear-resistant protective coating for magnetic-recording alloy thin films is disclosed. The protective coating includes a protective layer and an interfacial adhesion layer. The protective layer is preferably titanium diboride or amorphous nitrided carbon, and the interfacial adhesion layer is preferably titanium, but can alternatively be other metals, such as zirconium or hafnium, which share characteristics similar to titanium. More broadly, the protective layer may be a nitride, carbide, or boride, or mixture thereof, of titanium, zirconium, hafnium, tantalum, vanadium, niobium, tantalum, chromium, molybdenum, or tungsten, and the interfacial adhesion layer may be the corresponding metal of the protective layer compound.
Inventors
- 👤 Carl W. Nelson
- 👤 Richard D. Weir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:10
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/02; C23C14/024; C23C14/025; C23C14/06; C23C14/14; C23C14/16; C23C14/165; G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/726; G11B5/7262; G11B5/84; G11B5/8408; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
80 words
A method for depositing an interfacial layer and a protective layer on a magnetic-recording medium having a magnetic-recording layer, which method comprises the steps of: depositing an interfacial layer on the magnetic-recording layer, wherein the interfacial layer is composed of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, or tungsten; and then depositing a protective layer on the interfacial layer, wherein the protective layer is composed of a nitride, carbide, or boride of the element used in the interfacial layer.
Claim 2
Independent Claim
80 words
A method for depositing an interfacial layer and a protective layer on a magnetic-recording medium having a magnetic-recording layer, which method comprises the steps of: depositing an interfacial layer on the magnetic-recording layer, wherein the interfacial layer is composed of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, or tungsten; and then depositing a protective layer on the interfacial layer, wherein the protective layer is composed of a nitride, carbide, or boride of the element used in the interfacial layer.
Claim 3
Dependent Claim
36 words
A method as recited in claim 1 wherein the step of depositing an interfacial layer is performed by sputtering titanium, and wherein the step of depositing a protective layer is performed by reactive sputtering titanium diboride.
Claim 4
Dependent Claim
35 words
A method as recited in claim 1, wherein the steps of depositing the interfacial layer and the protective layer include forming energetic-atom-deposited dense fibrous Zone T structures for the interfacial layer and the protective layer.
Claim 5
Dependent Claim
25 words
A method as recited in claim 3, wherein the steps of depositing the interfacial layer and the protective layer include steps of substrate bias sputtering.
Claim 6
Dependent Claim
37 words
A method as recited in claim 1, wherein the step of depositing a protective layer includes sputtering a mixed binary compound of nitrides, carbides, or borides of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, or tungsten.
Claim 7
Independent Claim
68 words
A method for depositing an interfacial layer and a protective layer on a magnetic-recording medium having a magnetic-recording layer, which method comprises the steps of: depositing an interfacial layer on the magnetic-recording layer, wherein the interfacial layer is composed of titanium, zirconium, or hafnium; and then depositing a protective layer on the interfacial layer, wherein the interfacial layer is composed of amorphous nitrided carbon over the interfacial layer.
Claim 8
Independent Claim
68 words
A method for depositing an interfacial layer and a protective layer on a magnetic-recording medium having a magnetic-recording layer, which method comprises the steps of: depositing an interfacial layer on the magnetic-recording layer, wherein the interfacial layer is composed of titanium, zirconium, or hafnium; and then depositing a protective layer on the interfacial layer, wherein the interfacial layer is composed of amorphous nitrided carbon over the interfacial layer.
Claim 9
Dependent Claim
20 words
A method as recited in claim 6 wherein the step of depositing an interfacial layer is performed by sputtering titanium.
Claim 10
Dependent Claim
35 words
A method as recited in claim 6, wherein the steps of depositing the interfacial layer and the protective layer include forming energetic-atom-deposited dense fibrous Zone T structures for the interfacial layer and the protective layer.
Claim 11
Dependent Claim
25 words
A method as recited in claim 8, wherein the steps of depositing the interfacial layer and the protective layer include steps of substrate bias sputtering.
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) | 1998-09-25 | 1999-03-27 | 1999-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-25 | 2003-03-27 | 2003-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-25 | 2007-03-27 | 2007-09-26 | $7700.00 | Window Closed / Lapsed |