Patent US2532006A successfully refreshed from Google Patents.
Patent US4547754A successfully refreshed from Google Patents.
US4547754A
Expired / Lapsed
US
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Ferromagnetic resonator
Assignee: Sony Corp
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Filing: 1983-12-05
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Granted: 1985-10-15
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Expires: 2003-12-05
Abstract
Abstract A ferromagnetic resonator employing a disk of ferrimagnetic material is disclosed. The ferromagnetic resonator comprises a disk of ferrimagnetic material such as yttrium iron garnet (YIG) and a magnet applying D.C. magnetic field perpendicularly to a surface of the disk, and microstrip line applying RF magnetic field to the disk. The disk of ferrimagnetic material is processed to have a groove at a predetermined position on one surface of the disk, or to have a predetermined area in a central portion of the disk with a thickness smaller than that of peripheral portion of the disk, so that spurious response caused by magnetostatic mode other than the uniform mode is suppressed.
Inventors
- 👤 Yoshikazu Murakami
- 👤 Hiromi Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:37
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/215
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
74 words
A ferromagnetic resonator comprising: a layer of ferrimagnetic material; means for applying a DC magnetic field perpendicularly to said ferrimagnetic layer; means for applying an RF magnetic field to said ferrimagnetic layer so as to cause ferromagnetic resonance; said ferrimagnetic layer being processed, during fabrication, to have a groove at a predetermined position on one surface of said layer so that spurious response caused by magnetostatic modes other than a uniform mode is suppressed.
Claim 2
Dependent Claim
74 words
A ferromagnetic resonator comprising: a layer of ferrimagnetic material; means for applying a DC magnetic field perpendicularly to said ferrimagnetic layer; means for applying an RF magnetic field to said ferrimagnetic layer so as to cause ferromagnetic resonance; said ferrimagnetic layer being processed, during fabrication, to have a groove at a predetermined position on one surface of said layer so that spurious response caused by magnetostatic modes other than a uniform mode is suppressed.
Claim 3
Dependent Claim
82 words
A ferromagnetic resonator comprising: a layer of ferrimagnetic material; means for applying a DC magnetic field perpendicularly to said ferrimagnetic layer; means for applying an RF magnetic field to said ferrimagnetic layer so as to cause ferromagnetic resonance; said ferrimagnetic layer being processed, during fabrication, to have a predetermined area in a central portion thereof with a thickness smaller than the thickness of peripheral portions of said layer so that the internal D.C. magnetic field in said thinner area is made uniform.
Claim 4
Dependent Claim
82 words
A ferromagnetic resonator comprising: a layer of ferrimagnetic material; means for applying a DC magnetic field perpendicularly to said ferrimagnetic layer; means for applying an RF magnetic field to said ferrimagnetic layer so as to cause ferromagnetic resonance; said ferrimagnetic layer being processed, during fabrication, to have a predetermined area in a central portion thereof with a thickness smaller than the thickness of peripheral portions of said layer so that the internal D.C. magnetic field in said thinner area is made uniform.
Claim 5
Dependent Claim
25 words
A ferromagnetic resonator according to claim 1, wherein said groove is formed about a position at which RF magnetization of the uniform mode is nullified.
Claim 6
Dependent Claim
28 words
A ferromagnetic resonator according to claim 2, wherein said thinner area of said ferrimagnetic layer is an area in which RF magnetization of the uniform mode is nullified.
Claim 7
Dependent Claim
30 words
A ferromagnetic resonator according to any one of claims, 1 and 2, wherein said means for applying an RF magnetic field comprises a microstrip line coupled to said ferrimagnetic layer.
Claim 8
Dependent Claim
25 words
A ferromagnetic resonator according to any one of claims 1 and 2, wherein said means for applying a DC magnetic field comprises a permanent magnet.
Claim 9
Dependent Claim
22 words
A ferromagnetic resonator according to any one of claims 1 and 2, wherein said ferrimagnetic layer is formed on a non-magnetic substance.
Claim 10
Dependent Claim
20 words
A ferromagnetic resonator according to claim 7, wherein said ferrimagnetic layer comprises an film grown epitaxially on a GGG substrate.
References Cited (Backward Citations)
US3534276A
Cited
US3766494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |