US5100741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto-optic recording systems
Assignee: Intellectual Ventures Fund 83 LLC
•
Filing: 1988-05-12
•
Granted: 1992-03-31
•
Expires: 2008-05-12
Abstract
Abstract A magnetic thin film recording layer comprised primarily of a light rare earth element and a transition metal element is disclosed. Other elements are optionally included in the film. The film has an easy axis of magnetization perpendicular with respect to the surface of the film. Magneto-optic recording systems using such films are also disclosed.
Inventors
- 👤 Tatsuya Shimoda
- 👤 Satoshi Shimokawato
- 👤 Shin Funada
- 👤 Mamoru Sugimoto
- 👤 Akira Aoyama
- 👤 Satoshi Nebashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:00
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
A magneto-optic recording system comprising a thin film having magneto-optic recording properties having the composition consisting essentially of LR.sub.(1-x-y) TM.sub.x B.sub.y wherein: LR is a light rare earth element component and consists essentially of neodymium and praseodymium; TM is a transition metal component including iron and optionally at least one additional transition metal element selected from the group consisting of cobalt and nickel; B is Boron; x is the fractional amount of transition metal element component expressed as a decimal and is between about 0.6 and 0.95; and y is the fractional amount of Boron expressed as a decimal and is between about 0.0001 and 0.2.
Claim 2
Dependent Claim
106 words
A magneto-optic recording system comprising a thin film having magneto-optic recording properties having the composition consisting essentially of LR.sub.(1-x-y) TM.sub.x B.sub.y wherein: LR is a light rare earth element component and consists essentially of neodymium and praseodymium; TM is a transition metal component including iron and optionally at least one additional transition metal element selected from the group consisting of cobalt and nickel; B is Boron; x is the fractional amount of transition metal element component expressed as a decimal and is between about 0.6 and 0.95; and y is the fractional amount of Boron expressed as a decimal and is between about 0.0001 and 0.2.
Claim 3
Dependent Claim
16 words
The magneto-optic recording system of claim 1, wherein the transition metal component consists essentially of iron.
Claim 4
Dependent Claim
26 words
The magneto-optic recording system of claim 1, wherein iron is present in an amount of at least about 50 atomic percent of the transition metal component.
Claim 5
Dependent Claim
19 words
The magneto-optic recording system of claim 1, wherein the thin film having-magneto optic recording properties is prepared by sputtering.
Claim 6
Dependent Claim
11 words
The magneto-optic recording system of claim 1, wherein y=0.02 to 0.03.
Claim 7
Dependent Claim
47 words
A magneto-optic recording system comprising a thin film having magneto-optic recording properties, the thin film having a composition consisting essentially of about 20-40% Nd and Pr and the remainder a transition metal component including iron and optionally the addition of at least one of cobalt and nickel.
Claim 8
Dependent Claim
47 words
A magneto-optic recording system comprising a thin film having magneto-optic recording properties, the thin film having a composition consisting essentially of about 20-40% Nd and Pr and the remainder a transition metal component including iron and optionally the addition of at least one of cobalt and nickel.
Claim 9
Dependent Claim
18 words
The magneto-optic recording system of claim 6, wherein the transition metal component includes more than about 50% iron.
Claim 10
Dependent Claim
19 words
The magneto-optic recording system of claim 6, wherein the thin film having magneto-optic recording properties is prepared by sputtering.
References Cited (Backward Citations)
US3965463A
Cited
US4310899A
Cited
GB2069528A
Cited
US4390660A
Cited
US4489139A
Cited
US4496395A
Cited
JPS58165306A
Cited
EP0108474A2
Cited
EP0106948A2
Cited
JPS5984358A
Cited
US4612068A
Cited
US4544443A
Cited
EP0133758A2
Cited
US4695514A
Cited
JPS60182506A
Cited
US4579777A
Cited
US4710431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-31 | 1995-09-30 | 1996-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-31 | 1999-09-30 | 2000-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-31 | 2003-09-30 | 2004-03-31 | $7700.00 | Window Closed / Lapsed |