US4170689A
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Magneto-optic thin film for memory devices
Assignee: NTT Inc
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Filing: 1977-06-28
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Granted: 1979-10-09
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Expires: 1997-06-28
Abstract
Abstract A magneto-optic thin film for memory devices, having a composition defined by the formula Mnx(Cul-y,Niy,)yBiz WHEREIN X+Y+Z=1, 0.15</=X</=0.70, 0.10</=Y </=0.55, 0.11</=Z</=0.55 AND 0<Y'<1. The properties of the film are further improved by adding Ti, V, Cr, Fe, Nb, Te, Y, Ce, Nd, Gd, Dy, Co, Pd or Rh.
Inventors
- 👤 Akinori Katsui
- 👤 Kazumichi Egashira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:11
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/12; H01F10/14; G; G03; G03G; G03G5/00; G03G5/16; G11; G11C; G11C13/00; G11C13/04; G11C13/06; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
35 words
A magneto-optic thin film on a substrate for memory devices, said film consisting essentially a composition defined by the formula Mn.sub.x (Cu.sub.1-y,Ni.sub.y') Bi.sub.z wherein X+y+z=1, 0.15≦x≦0.70, 0.10≦y≦0.55, 0.11≦z≦0.55, and y' is from 0.11 to 0.95.
Claim 2
Dependent Claim
35 words
A magneto-optic thin film on a substrate for memory devices, said film consisting essentially a composition defined by the formula Mn.sub.x (Cu.sub.1-y,Ni.sub.y') Bi.sub.z wherein X+y+z=1, 0.15≦x≦0.70, 0.10≦y≦0.55, 0.11≦z≦0.55, and y' is from 0.11 to 0.95.
Claim 3
Dependent Claim
13 words
The magneto-optic thin film according to claim 1, wherein 0.20≦x≦0.55, 0.15≦y≦0.45 and 0.13≦z≦0.43.
Claim 4
Dependent Claim
73 words
A magneto-optic thin film on a substrate for memory devices, said film consisting essentially of Mn, Cu, Ni, Bi and a fifth element, said Mn, Cu, Ni and Bi having the relationship defined by the formula Mn.sub.x (Cu.sub.-y,Ni.sub.y')Bi.sub.z wherein x+y+z=1, 0.15≦x≦0.70, 0.10≦y≦0.55, 0.11≦z≦0.55, and y' is from 0.11 to 0.95, and said fifth element is selected from the group consisting of Ti, V, Cr, Fe, Nb, Te, Y, Ce, Nd, Gd and Dy.
Claim 5
Dependent Claim
73 words
A magneto-optic thin film on a substrate for memory devices, said film consisting essentially of Mn, Cu, Ni, Bi and a fifth element, said Mn, Cu, Ni and Bi having the relationship defined by the formula Mn.sub.x (Cu.sub.-y,Ni.sub.y')Bi.sub.z wherein x+y+z=1, 0.15≦x≦0.70, 0.10≦y≦0.55, 0.11≦z≦0.55, and y' is from 0.11 to 0.95, and said fifth element is selected from the group consisting of Ti, V, Cr, Fe, Nb, Te, Y, Ce, Nd, Gd and Dy.
Claim 6
Dependent Claim
38 words
The magneto-optic thin film according to claim 3, wherein said fifth element is selected from the group consisting of Ti, V, Cr, Fe and Nb, and is in an amount of 0.035 mol per mol of said composition.
Claim 7
Dependent Claim
38 words
The magneto-optic thin film according to claim 3, wherein said fifth element is selected from the group consisting of Ti, V, Cr, Fe and Nb, and is in an amount of 0.07 mol per mol of said composition.
Claim 8
Dependent Claim
38 words
The magneto-optic thin film according to claim 3, wherein said fifth element is selected from the group consisting of Y, Ce, Nd, Gd and Dy, and is in an amount of 0.075 mol per mol of said composition.
Claim 9
Dependent Claim
38 words
The magneto-optic thin film according to claim 3, wherein said fifth element is selected from the group consisting of Y, Ce, Nd, Gd and Dy, and is in an amount of 0.15 mol per mol of said composition.
Claim 10
Dependent Claim
25 words
The magneto-optic thin film according to claim 3, wherein said fifth element is Te in an amount of 0.03 mol per mol of said composition.
Claim 11
Dependent Claim
25 words
The magneto-optic thin film according to claim 3, wherein said fifth element is Te in an amount of 0.06 mol per mol of said composition.
Claim 12
Dependent Claim
65 words
A magneto-optic thin film on a substrate for memory devices, said film consisting essentially of Mn, Cu, Ni, Bi and a fifth element, said Mn, Cu, Ni and Bi having the relationship defined by the formula Mn.sub.x (Cu.sub.1-y,Ni.sub.y')Bi.sub.z wherein x+y+z=1, 0.15≦x≦0.70, 0.10≦y≦0.55, 0.11≦z≦0.55, and y' is from 0.11 to 0.95, and said fifth element is selected from the group consisting of Co, Pd and Rh.
Claim 13
Dependent Claim
65 words
A magneto-optic thin film on a substrate for memory devices, said film consisting essentially of Mn, Cu, Ni, Bi and a fifth element, said Mn, Cu, Ni and Bi having the relationship defined by the formula Mn.sub.x (Cu.sub.1-y,Ni.sub.y')Bi.sub.z wherein x+y+z=1, 0.15≦x≦0.70, 0.10≦y≦0.55, 0.11≦z≦0.55, and y' is from 0.11 to 0.95, and said fifth element is selected from the group consisting of Co, Pd and Rh.
Claim 14
Dependent Claim
25 words
The magneto-optic thin film according to claim 10, wherein said fifth element is Co in an amount of 0.07 mol per mol of said composition.
Claim 15
Dependent Claim
25 words
The magneto-optic thin film according to claim 10, wherein said fifth element is Pd in an amount of 0.14 mol per mol of said composition.
Claim 16
Dependent Claim
25 words
The magneto-optic thin film according to claim 10, wherein said fifth element is Rh in an amount of 0.07 mol per mol of said composition.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |