Patent EP0146323A2 successfully refreshed from Google Patents.
EP0146323A2
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EP
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Methods of making magnetic recording media(111111])
Assignee: Sony Corp
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Filing: 1984-12-07
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Granted: —
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Expires: 2004-12-07
Abstract
Abstract A method of making a magnetic recording medium includes sputtering a magnetic material containing iron onto a substrate (3) in an atmosphere of argon gas mixed with nitrogen gas to deposit a magnetic film on the substrate (3). The nitrogen is preferably present in an amount of 10 to 10000 ppm, and a preferred version of the method comprises jointly sputtering a rare earth metal and an iron-cobalt alloy.
Inventors
- 👤 Noboru C/O Patent Division Sony Corporation Sato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:41
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/0021; C23C14/0036; G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B11/10589; G11B11/10591; G11B5/00; G11B5/84; G11B5/851
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
37 words
A method of making a magnetic recording medium; characterised by: sputting a magnetic material containing iron onto a substrate in an atmosphere of argon gas mixed with nitrogen gas to form a magnetic film on said substrate.
Claim 2
Independent Claim
37 words
A method of making a magnetic recording medium; characterised by: sputting a magnetic material containing iron onto a substrate in an atmosphere of argon gas mixed with nitrogen gas to form a magnetic film on said substrate.
Claim 3
Dependent Claim
19 words
A method according to claim 1 wherein said nitrogen is present in an amount of 10 to 10000 ppm.
Claim 4
Dependent Claim
24 words
A method according to claim 1 wherein a first source of sputtered metal in said atmosphere is a target of a rare earth metal.
Claim 5
Dependent Claim
24 words
A method according to claim 3 wherein said sputtering takes place with a second source of sputtered metal including a target of FeCo alloy.
Claim 6
Dependent Claim
22 words
A method according to claim 1 wherein said atmosphere of argon is at a pressure of 10 -2 to 10 -3 Torr.
Claim 7
Dependent Claim
18 words
A method according to claim 4 wherein said FeCo alloy has the composition Fe 95-50 Co 5-50 .
Claim 8
Dependent Claim
18 words
A method according to claim 4 wherein said FeCo alloy has the composition Fe 95-70 C° 5-30 .
Claim 9
Dependent Claim
12 words
A method according to claim 3 wherein said rare earth is Tb.
Claim 10
Dependent Claim
16 words
A magnetic recording medium made by a method according to any one of the preceding claims.
References Cited (Backward Citations)
No citation records indexed.
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