EP0330116A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Magnetic recording medium
Assignee: Sony Corp
•
Filing: 1989-02-20
•
Granted: —
•
Expires: 2009-02-20
Abstract
Abstract A magnetic thin film having a composition represented by the following formula: (Co a Pt b B c M d ) 100-x O x wherein a, b, c, d and x represent atomic percents of respective elements and satisfy relationships expressed as a = 100 - b - c - d 0 < a 0 < b ≦ 50 0 ≦ c ≦ 30 0 ≦ d ≦ 30 0 ≦ x ≦ 15 and M represents at least one of the following constituents selected from a group of constituents which consists of Ti, Zr, V, Cr, Nb, Mo, Ta and W. A magnetic recording medium having the above-mentioned magnetic thin film is also described.
Inventors
- 👤 Kazuhiko Hayashi
- 👤 Akihiko Okabe
- 👤 Masatoshi Hayakawa
- 👤 Koichi Aso
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 13:56
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/65; G11B5/656; G11B5/658; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
100 words
A magnetic thin film having a composition represented by the following formula: (Co a Pt b B c M d ) 100-x O x wherein a, b, c, d and x represent atomic percents of respective elements and satisfy relationships expressed as 0 < a 0 < b ≦ 50 0 ≦ c ≦ 30 0 ≦ d ≦ 30 a + b + c + d = 100 0 ≦ x ≦ 15 and M represents at least one of the following constituents selected from the group which consists of Ti, Zr, V, Cr, Nb, Mo, Ta and W.
Claim 2
Dependent Claim
100 words
A magnetic thin film having a composition represented by the following formula: (Co a Pt b B c M d ) 100-x O x wherein a, b, c, d and x represent atomic percents of respective elements and satisfy relationships expressed as 0 < a 0 < b ≦ 50 0 ≦ c ≦ 30 0 ≦ d ≦ 30 a + b + c + d = 100 0 ≦ x ≦ 15 and M represents at least one of the following constituents selected from the group which consists of Ti, Zr, V, Cr, Nb, Mo, Ta and W.
Claim 3
Dependent Claim
25 words
A magnetic thin film according to claim 1, wherein c is zero, d is greater than zero and a + b + d = 100.
Claim 4
Dependent Claim
25 words
A magnetic thin film according to claim 1, wherein c is greater than zero, d is zero, and a + b + c = 100.
Claim 5
Dependent Claim
12 words
A magnetic thin film according to claim 3, wherein z is zero.
Claim 6
Dependent Claim
44 words
A magnetic thin film having a composition represented by the following formula: Co a B c wherein a and c represent atomic percents of respective elements and satisfy relationships expressed as 0 < a 0 < c ≦ 30 a + c = 100.
Claim 7
Dependent Claim
44 words
A magnetic thin film having a composition represented by the following formula: Co a B c wherein a and c represent atomic percents of respective elements and satisfy relationships expressed as 0 < a 0 < c ≦ 30 a + c = 100.
Claim 8
Dependent Claim
49 words
A magnetic recording medium comprising a magnetic thin film which has a composition represented by the formula: Co a B c wherein a and c represent atomic percents of respective elements and satisfy relationships expressed as 0 < a 0 < c ≦ 30 a + c = 100.
Claim 9
Dependent Claim
49 words
A magnetic recording medium comprising a magnetic thin film which has a composition represented by the formula: Co a B c wherein a and c represent atomic percents of respective elements and satisfy relationships expressed as 0 < a 0 < c ≦ 30 a + c = 100.
Claim 10
Dependent Claim
108 words
A magnetic recording medium comprising a magnetic thin film which has a composition represented by the following formula: (Co a Pt b B c M d ) 100-x O x wherein a, b, c, d and x represent atomic percents of respective elements and satisfy relationships expressed as 0 < a 0 < b ≦ 50 0 ≦ c ≦ 30 0 ≦ d ≦ 30 a + b + c + d = 100 0 ≦ x ≦ 15 and M represents at least one of the following constituents selected from a group of constituents which consists of Ti, Zr, V, Cr, Nb, Mo, Ta and W.
Claim 11
Dependent Claim
108 words
A magnetic recording medium comprising a magnetic thin film which has a composition represented by the following formula: (Co a Pt b B c M d ) 100-x O x wherein a, b, c, d and x represent atomic percents of respective elements and satisfy relationships expressed as 0 < a 0 < b ≦ 50 0 ≦ c ≦ 30 0 ≦ d ≦ 30 a + b + c + d = 100 0 ≦ x ≦ 15 and M represents at least one of the following constituents selected from a group of constituents which consists of Ti, Zr, V, Cr, Nb, Mo, Ta and W.
Claim 12
Dependent Claim
25 words
A magnetic recording medium according to claim 7, wherein c is zero, d is greater than zero and a + b + d = 100.
Claim 13
Dependent Claim
25 words
A magnetic recording medium according to claim 7, wherein c is greater than zero, d is zero and a + b + c = 100.
Claim 14
Dependent Claim
12 words
A magnetic recording medium according to claim 9, wherein x is zero.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.