US5134038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin film magnetic recording medium with controlled grain morphology and topology
Assignee: International Business Machines Corp
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Filing: 1991-09-04
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Granted: 1992-07-28
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Expires: 2011-09-04
Abstract
Abstract A magnetic storage medium is composed of a non-wettable substrate upon which a transient liquid metal layer is deposited and maintained as a distribution of discontinuous liquid features. A magnetic film layer is deposited on the transient liquid metal layer resulting in a reaction of the liquid metal with the magnetic film. The topology of the magnetic film is controllable by adjusting the thickness of the transient liquid metal layer.
Inventors
- 👤 Robert J. Baseman
- 👤 Christopher V. Jahnes
- 👤 Igor Y. Khandros
- 👤 Seyyed M. T. Mirzamaani
- 👤 Michael A. Russak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73911; G11B5/73921; G11B5/7368; G11B5/7369; G11B5/73917; G11B5/73923; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/922; Y10S428/9265; Y10S428/928; Y10S428/9335; Y10S428/939; Y10T; Y10T428/00; Y10T428/12; Y10T428/12465; Y10T428/12472; Y10T428/12486; Y10T428/12493; Y10T428/12535; Y10T428/12681; Y10T428/12771; Y10T428/12806; Y10T428/12812; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
99 words
A magnetic storage medium comprising: a substantially non-wettable substrate; a transient liquid metal layer of a thickness substantially in the range of 25-300 angstroms deposited upon said substrate while said substrate is maintained at a temperature in excess of the melting point of said liquid metal to form a distribution of disconnected molten metal spherical structures; an intermediate metal film layer deposited upon said transient liquid metal layer; and a magnetic film layer subsequently deposited on said intermediate metal film layer, whereby said intermediate metal film layer controls reaction of said transient liquid metal and said magnetic film layer.
Claim 2
Dependent Claim
99 words
A magnetic storage medium comprising: a substantially non-wettable substrate; a transient liquid metal layer of a thickness substantially in the range of 25-300 angstroms deposited upon said substrate while said substrate is maintained at a temperature in excess of the melting point of said liquid metal to form a distribution of disconnected molten metal spherical structures; an intermediate metal film layer deposited upon said transient liquid metal layer; and a magnetic film layer subsequently deposited on said intermediate metal film layer, whereby said intermediate metal film layer controls reaction of said transient liquid metal and said magnetic film layer.
Claim 3
Dependent Claim
53 words
A magnetic storage medium as set forth in claim 1 wherein said transient liquid metal layer is selected from the group consisting of gallium, indium, tin, bismuth, lead, cadmium, mercury, selenium, tellurium and their alloys with other metals including silver, palladium, platinum and gold, and binary and ternary compounds of the liquid metals.
Claim 4
Dependent Claim
26 words
A magnetic storage medium as set forth in claim 1, wherein said magnetic film layer is an alloy of which cobalt is is a major constituent
Claim 5
Dependent Claim
26 words
A magnetic storage medium as set forth in claim wherein said magnetic film layer is selected from the group consisting of Co-Pt-Cr, Co-Cr, Co-Ni-Cr, and Co-Re.
Claim 6
Dependent Claim
17 words
A magnetic storage medium as set forth in claim 1 wherein said transient liquid metal comprises gallium.
Claim 7
Dependent Claim
17 words
A magnetic storage medium as set forth in claim 1 wherein said transient liquid metal comprises indium.
Claim 8
Dependent Claim
43 words
A magnetic storage medium as set forth in claim 1 wherein said substrate is selected from the group consisting of silicon dioxide, glass, polymers and metal substrates treated in such a manner as to be rendered substantially non-wettable to said transient liquid metal.
Claim 9
Dependent Claim
24 words
A magnetic storage medium as set forth in claim 1 wherein said thickness is selected for controlling the topology of said magnetic film layer.
Claim 10
Dependent Claim
25 words
A magnetic storage medium as set forth in claim 8 wherein said transient liquid metal layer is deposited at a preselected region of said substrate.
Claim 11
Dependent Claim
29 words
A magnetic storage medium as set forth in claim 1, wherein said intermediate metal film layer is selected from the group consisting of chromium, palladium, tantalum, molybdenum and vanadium.
Claim 12
Dependent Claim
24 words
A magnetic storage medium as set forth in claim 1, wherein said transient liquid metal is deposited at a preselected region of said substrate.
Claim 13
Dependent Claim
161 words
A magnetic storage medium having controllable surface surface topology comprising: a substantially non-wettable substrate; a transient liquid metal layer of a thickness substantially in the range of 25-300 angstroms deposited upon said substrate while said substrate is maintained at a temperature in excess of the melting point of said liquid metal to form a distribution of discontinued molten metal spherical structures, wherein said transient liquid metal is selected from the group consisting of gallium, indium, thin, bismuth, lead, cadmium, mercury, selenium, tellerium and their alloys with other metals including silver, palladium, platinum and gold, and binary and ternary compounds of the liquid metals; an intermediate metal film layer deposited upon said transient liquid metal layer, and a magnetic film layer subsequently deposited upon said intermediate metal film layer, wherein said intermediate metal film layer controls reaction of said transient liquid metal and said magnetic film layer and said predetermined thickness is selected for controlling the topology of said magnetic film layer.
Claim 14
Dependent Claim
161 words
A magnetic storage medium having controllable surface surface topology comprising: a substantially non-wettable substrate; a transient liquid metal layer of a thickness substantially in the range of 25-300 angstroms deposited upon said substrate while said substrate is maintained at a temperature in excess of the melting point of said liquid metal to form a distribution of discontinued molten metal spherical structures, wherein said transient liquid metal is selected from the group consisting of gallium, indium, thin, bismuth, lead, cadmium, mercury, selenium, tellerium and their alloys with other metals including silver, palladium, platinum and gold, and binary and ternary compounds of the liquid metals; an intermediate metal film layer deposited upon said transient liquid metal layer, and a magnetic film layer subsequently deposited upon said intermediate metal film layer, wherein said intermediate metal film layer controls reaction of said transient liquid metal and said magnetic film layer and said predetermined thickness is selected for controlling the topology of said magnetic film layer.
Claim 15
Dependent Claim
28 words
A magnetic storage medium as set forth in claim 12 wherein said intermediate metal film layer is selected from group consisting of chromium, palladium, tantalum, molybdenum and vanadium.
Claim 16
Dependent Claim
24 words
A magnetic storage medium as set forth in claim 13 wherein said magnetic layer is an alloy of which cobalt is a major constituent.
Claim 17
Dependent Claim
26 words
A magnetic storage medium as set forth in claim 14 wherein said magnetic layer is selected from the group consisting of Co-Pt-Cr, Co-Cr, Co-Ni-Cr and Co-Re.
References Cited (Backward Citations)
US4539265A
Cited
EP0079391A1
Cited
US4493856A
Cited
US4543301A
Cited
US4539264A
Cited
US4746580A
Cited
JPS62103823A
Cited
JPS62112774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-28 | 1996-01-27 | 1996-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-28 | 2000-01-27 | 2000-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-28 | 2004-01-27 | 2004-07-28 | $7700.00 | Window Closed / Lapsed |