US3880602A
Expired / Lapsed
US
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Thin layer magnetic structures for binary information stores
Assignee: Centre National de la Recherche Scientifique
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Filing: 1971-01-21
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Granted: 1975-04-29
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Expires: 1991-01-21
Abstract
Abstract In binary data information stores, the storing member may comprise a thin layer magnetic structure made of at least one ferromagnetic layer, or of two such layers interacting through a non-magnetic film coupling. In such structures, the so-called ''''creep'''' phenomenon, and other disturbing phenomenons, lessen when the coercive magnetic field increases. Said coercive magnetic field is made of an increased apparent value from providing one of the faces of such a structure with a thin lamina of a magnetic material having a rigid magnetic lattice which is randomly inorganized at the microscopic scale.
Inventors
- 👤 Jean Valin
- 👤 Jean Claude Bruyere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:31
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/32; H01F10/3218; B; B82; B82Y; B82Y25/00; H01F10/08; H01F10/10; Y; Y10; Y10S; Y10S29/00; Y10S29/028; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10S428/9335; Y10S428/941; Y10T; Y10T428/00; Y10T428/12; Y10T428/12465; Y10T428/12493; Y10T428/12535; Y10T428/12597; Y10T428/12771; Y10T428/12778; Y10T428/12861
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A THIN LAYER MAGNETIC STRUCTURE FOR USE AS A BINARY INFORMATION STORE COMPRISING: A NON-MAGNETIC BASE; A LAMINATED MAGNETIC STRUCTURE SUPPORTED BY SAID BASE AND INCLUDING ONE LAMINA OF A MATERIAL OF ANTIFERROMAGNETIC CHARACTER, THE MAGNETIC SPINS OF THE CRYSTALLITES OF SAID MATERIAL BEING RANDOMLY ORGANIZED AND ANOTHER LAMINA OF FERROMAGNETIC MATERIAL OF UNIAXIAL ANISOTROPY INTIMATELY OVERLYING SAID ONE LAMINA.
Claim 2
Dependent Claim
60 words
A THIN LAYER MAGNETIC STRUCTURE FOR USE AS A BINARY INFORMATION STORE COMPRISING: A NON-MAGNETIC BASE; A LAMINATED MAGNETIC STRUCTURE SUPPORTED BY SAID BASE AND INCLUDING ONE LAMINA OF A MATERIAL OF ANTIFERROMAGNETIC CHARACTER, THE MAGNETIC SPINS OF THE CRYSTALLITES OF SAID MATERIAL BEING RANDOMLY ORGANIZED AND ANOTHER LAMINA OF FERROMAGNETIC MATERIAL OF UNIAXIAL ANISOTROPY INTIMATELY OVERLYING SAID ONE LAMINA.
Claim 3
Dependent Claim
37 words
Structure according to claim 1, wherein the face of said thin ferromagnetic layer opposite to said lamina is coated by a thin film of a non-magnetic material itself coated by a further layer of a ferromagnetic material.
Claim 4
Dependent Claim
26 words
Structure according to claim 2, wherein the material of said further layer is magnetically softer than the material of the ferromagnetic layer cooperating with said lamina.
Claim 5
Dependent Claim
44 words
Structure according to claim 1, wherein the material of said one lamina is selected from the group consisting of nickel-iron-manganese alloy and nickel-cobalt-iron-manganese alloy, and wherein said ferromagnetic layer consists of a material selected from the group consisting of nickel-iron alloy and nickel-cobalt-iron alloy.
Claim 6
Dependent Claim
43 words
Structure according to claim 1 wherein said laminae have at least one common metallic component which is an alloy including at least iron and nickel and in which said one lamina includes manganese as a distinct component to render it antiferromagnetic in character.
Claim 7
Dependent Claim
17 words
Structure according to claim 5, wherein the said common metallic component consists of a ternary iron-nickel-cobalt alloy.
Claim 8
Dependent Claim
23 words
Structure according to claim 5, wherein said one lamina is comprised of a part of the said ferromagnetic alloy containing manganese diffused therein.
References Cited (Backward Citations)
US3350180A
Cited
US2988466A
Cited
US3110613A
Cited
US3330631A
Cited
US3243269A
Cited
US3219353A
Cited
US3383761A
Cited
US3525638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |