US4857415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing single crystalline magnetic film having bi-axial anisotropy
Assignee: Raytheon Co
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Filing: 1987-05-29
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Granted: 1989-08-15
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Expires: 2007-05-29
Abstract
Abstract A single crystal Fe film is deposited on a (100) gallium arsenide substrate by ion beam sputtering the Fe film. The sputtered Fe atoms are imparted with energies in the range of about 1 electron volt to at least 10 electron volts to impart sufficient kinetic energy to said ions to allow said ions to have high surface diffusion rates, thereby permitting the atoms to be located at the proper lattice sites of the Fe crystal formed over the gallium arsenide substrate.
Inventors
- 👤 Randal W. Tustison
- 👤 Thomas Varitimos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:15
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/34; C23C14/46; C30; C30B; C30B23/00; C30B23/002; C30B23/02; C30B29/00; C30B29/02; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12528; Y10T428/12681
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
31 words
In combination: a layer comprising gallium arsenide having a <100> oriented surface; and a layer comprising a single crystal of a metal disposed on said <100> surface of the gallium arsenide.
Claim 2
Dependent Claim
31 words
In combination: a layer comprising gallium arsenide having a <100> oriented surface; and a layer comprising a single crystal of a metal disposed on said <100> surface of the gallium arsenide.
Claim 3
Dependent Claim
12 words
The combination as recited in claim 1 wherein the metal is Fe.
Claim 4
Dependent Claim
37 words
The combination as recited in claim 2 wherein said Fe layer has an X-ray rocking curve characterized in having a single energy intensity peak at a diffraction angle corresponding to the {200} planes of the Fe layer.
Claim 5
Dependent Claim
17 words
The combination of claim 3 wherein said Fe layer has a thickness greater than about 300 A.
Claim 6
Dependent Claim
17 words
The combination of claim 3 wherein said Fe layer has a thickness greater than about 850 A.
Claim 7
Dependent Claim
59 words
An article comprising: a substrate comprising a single crystal gallium arsenide having a <100> orientated surface; and a layer of a single crystal of Fe disposed on said <100> of gallium arsenide, said layer of Fe having a cubic structure with a pair of mutually orthogonal <010> and <001> directions disposed in the plane of the <100> orientated surface.
Claim 8
Dependent Claim
59 words
An article comprising: a substrate comprising a single crystal gallium arsenide having a <100> orientated surface; and a layer of a single crystal of Fe disposed on said <100> of gallium arsenide, said layer of Fe having a cubic structure with a pair of mutually orthogonal <010> and <001> directions disposed in the plane of the <100> orientated surface.
Claim 9
Dependent Claim
75 words
The article of claim 6 wherein said Fe layer has a magnetic moment characteristic, relative to an angle θ where θ is the angle between an applied field and one of the pair magnetization axes of the Fe layer, said magnetic moment having a first substantially equal magnitude at θ corresponding to θ=0°,90°,180° and equivalent angles thereof, and a second, different substantially equal magnitude at θ corresponding to θ=45°,135°, and 225° and equivalent angles thereof.
Claim 10
Dependent Claim
27 words
The article of claim 6 wherein said Fe layer is characterized by a magnetic characteristic which has a biaxial anisotropy field without any significant uni-axial anisotropy field.
Claim 11
Dependent Claim
64 words
The article of claim 6 wherein said Fe layer is characterized by a magnetic characteristic which in response to an applied ferromagnetic resonance signal of 17.275 GHz has a ferromagnetic resonance field H RES which varies as a function of an angle θ between the applied field and the <011> axis of the Fe layer, substantially sinusoidially between about 1000 Oe and 2000 Oe.
Claim 12
Dependent Claim
17 words
The article of claim 8 wherein the Fe layer has a thickness greater than about 300 Å.
Claim 13
Dependent Claim
17 words
The article of claim 8 wherein the Fe layer has a thickness greater than about 850 Å.
Claim 14
Dependent Claim
35 words
An article comprising: a substrate of gallium arsenide having a surface of <100> crystal faces; and a layer of Fe having {100} crystal faces disposed on said {100} crystal faces of said gallium arsenide substrate.
Claim 15
Dependent Claim
35 words
An article comprising: a substrate of gallium arsenide having a surface of <100> crystal faces; and a layer of Fe having {100} crystal faces disposed on said {100} crystal faces of said gallium arsenide substrate.
Claim 16
Dependent Claim
24 words
The article of claim 12 wherein said {100} surface of GaAs is the {100} orientation, misaligned 2° within ±0.5° towards the nearest <110> axis.
Claim 17
Dependent Claim
29 words
The article of claim 13 wherein said Fe layer has a pair of <010> and <001> crystal directions disposed in a common plane on the <100> orientated substrate surface.
Claim 18
Dependent Claim
24 words
The article of claim 14 wherein said Fe layer has a natural bi-axial anisotropy magnetic field without any significant superimposed uni-axial anisotropy magnetic field.
Claim 19
Dependent Claim
93 words
An article comprising: a substrate of single crystal gallium arsenide having a <100> orientation surface misaligned 2° within ±0.5° towards the nearest <110> axis; and a layer of single crystal Fe having a selected thickness disposed on said <100> surface of gallium arsenide, having a cubic structure with a pair of mutually orthogonal <010> and <001> directions disposed in the plane of the <100> orientated surfaces, with at least a portion of the Fe layer disposed closest to the substrate having a magnetic biaxial anisotropic field without any significant superimposed uniaxial anisotropic field.
Claim 20
Dependent Claim
93 words
An article comprising: a substrate of single crystal gallium arsenide having a <100> orientation surface misaligned 2° within ±0.5° towards the nearest <110> axis; and a layer of single crystal Fe having a selected thickness disposed on said <100> surface of gallium arsenide, having a cubic structure with a pair of mutually orthogonal <010> and <001> directions disposed in the plane of the <100> orientated surfaces, with at least a portion of the Fe layer disposed closest to the substrate having a magnetic biaxial anisotropic field without any significant superimposed uniaxial anisotropic field.
Claim 21
Dependent Claim
19 words
The article of claim 16 wherein said portion of the Fe layer has a thickness of about 570 A.
References Cited (Backward Citations)
US3573485A
Cited
US3788890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |