US3770395A
Expired / Lapsed
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Ferromagnetic material
Assignee: International Business Machines Corp
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Filing: 1972-09-15
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Granted: 1973-11-06
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Expires: 1992-09-15
Abstract
Abstract A room temperature stable ferromagnetic permanent magnet ternary intermetallic compound with a large Faraday rotation and having a Curie temperature in the region of substantially 75*-190*C having atomic proportions indicated by the formula:
Inventors
- 👤 E Sawatzky
- 👤 G Street
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:41
CPC Classifications
C; C22; C22C; C22C28/00; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/0302; H01F1/0306; H01F1/032; H01F1/04; H01F10/00; H01F10/08; H01F10/10; H01F10/12; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12674; Y10T428/12681; Y10T428/12771
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
20 words
A ferromagnetic composition consisting essentially of a ternary compound having atomic proportions indicated by the formula Mn0.8 1.2Ga0.8 1.2Ge0.8 1.2.
Claim 2
Dependent Claim
20 words
A ferromagnetic composition consisting essentially of a ternary compound having atomic proportions indicated by the formula Mn0.9 1.9Ga0.9 1.1Ge0.9 1.1.
Claim 3
Dependent Claim
17 words
A ferromagnetic composition consisting essentially of a ternary compound having atomic proportions indicated by the formula Mn1.0Ga1.0Ge1.0.
Claim 4
Dependent Claim
17 words
A ferromagnetic composition consisting essentially of a ternary compound having atomic properties indicated by the formula Mn1.0Ga0.95Ge1.0.
Claim 5
Dependent Claim
17 words
A ferromagnetic composition consisting essentially of a ternary compound having atomic properties indicated by the formula Mn1.0Ga0.8Ge0.95.
Claim 6
Dependent Claim
17 words
A ferromagnetic composition consisting essentially of a ternary compound having atomic properties indicated by the formula Mn1.0Ga.74Ge1.6.
Claim 7
Dependent Claim
17 words
A ferromagnetic composition consisting essentially of a ternary compound having atomic properties indicated by the formula Mn1.0Ga0.95Ge2.3.
Claim 8
Dependent Claim
17 words
A ferromagnetic composition consisting essentially of the elements manganese, germanium and gallium, and having a tetragonal structure.
Claim 9
Dependent Claim
20 words
A ferromagnetic composition consisting essentially of a ternary compound having atomic proportions indicated by the formula Mn0.8 1.2Ga0.5 1.3Ge0.6 1.9.
Claim 10
Dependent Claim
60 words
A data storage medium comprising a magnetic film upon a non-magnetic substrate, the magnetic film consisting essentially of a ternary compound having atomic properties indicated by the formula MnGa1 xMxGe where 0<x < or = limit of solid solubility of M in the ternary tetragonal MnGaGe structure, and M is chosen from the group consisting of Al, In, B, Tl.
Claim 11
Dependent Claim
14 words
The data storage medium of claim 11 wherein the substrate is a non-magnetic metal.
Claim 12
Dependent Claim
14 words
The data storage medium of claim 11 wherein the substrate is a glass material.
Claim 13
Dependent Claim
14 words
The data storage medium of claim 11 wherein the substrate is a ceramic material.
Claim 14
Dependent Claim
46 words
A ferromagnetic composition of matter consisting essentially of the composition in atomic proportions of MnGa1 xMxGe where 0<x < or = limit of solid solubility of M in the ternary tetragonal MnGaGe structure, and M is chosen from the group consisting of B, Al, In, Tl.
Claim 15
Dependent Claim
11 words
The composition of claim 15 wherein X < or = 0.025.
Claim 16
Dependent Claim
29 words
A data storage medium comprising a magnetic film upon a non-magnetic substrate, the magnetic film consisting essentially of the elements manganese, germanium and gallium, and having a tetragonal structure.
Claim 17
Dependent Claim
14 words
The magnetic film of claim 17 wherein the composition is Mn0.8 1.2Ga0.5 1.3Ge0.6 2.3.
Claim 18
Dependent Claim
14 words
The data storage medium of claim 17 wherein the substrate is a non-maGnetic metal.
Claim 19
Dependent Claim
14 words
The data storage medium of claim 17 wherein the substrate is a glass material.
Claim 20
Dependent Claim
14 words
The data storage medium of claim 17 wherein the substrate is a ceramic material.
Claim 21
Dependent Claim
25 words
The magnetic film of claim 17 including the addition of a Group III element chosen from the group consisting of aluminum, indium, thallium, and boron.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |