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US4859256A
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High permeability amorphous magnetic material
Assignee: Toshiba Corp
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Filing: 1987-01-30
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Granted: 1989-08-22
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Expires: 2007-01-30
Abstract
Abstract To obtain a high permeability magnetic core, the core is made of a 5 to 25 μm thick ribbon of a Co-based amorphous alloy with a Curie temperature Tc between 120° C. and 270° C., and further heat treated at a temperature below Tc within a magnetic field (1 Oe or more) applied in the lateral direction of the thin ribbon. Further, the saturation magnetostriction constant of the ribbon should be -2 to 1×10 -6 .
Inventors
- 👤 Takao Sawa
- 👤 Susumu Hashimoto
- 👤 Koichiro Inomata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:33
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/10; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15341; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
A heat treated, high permeability magnetic material in the form of a ribbon having a thickness of 5 to 25 μm consisting essentially of a Co-based amorphous alloy with a Curie temperature Tc of 120° C.≦Tc≦270° C., wherein said material has been heat treated to increase the permeability of said material by heating at a temperature below the Curie temperature and within a magnetic field applied transverse to the axis of said ribbon, and wherein said Co-based amorphous alloy is expressed as (Co.sub.1-a Fe.sub.a).sub.100-z (Si.sub.1-y B.sub.y).sub.z 0.02≦a≦0.08 0.3≦y≦0.5 25≦z≦32 where a, y and z are constants expressed by atomic ratio.
Claim 2
Dependent Claim
100 words
A heat treated, high permeability magnetic material in the form of a ribbon having a thickness of 5 to 25 μm consisting essentially of a Co-based amorphous alloy with a Curie temperature Tc of 120° C.≦Tc≦270° C., wherein said material has been heat treated to increase the permeability of said material by heating at a temperature below the Curie temperature and within a magnetic field applied transverse to the axis of said ribbon, and wherein said Co-based amorphous alloy is expressed as (Co.sub.1-a Fe.sub.a).sub.100-z (Si.sub.1-y B.sub.y).sub.z 0.02≦a≦0.08 0.3≦y≦0.5 25≦z≦32 where a, y and z are constants expressed by atomic ratio.
Claim 3
Dependent Claim
22 words
The magnetic material as set forth in claim 1, wherein the Curie temperature Tc of said amphorous alloy is 220° C.≦Tc≦250° C.
Claim 4
Dependent Claim
24 words
The magnetic material as set forth in claim 1, wherein the saturation magnetostriction constant λs of said Co-based amorphous alloy is -2×10.sup.-6 ≦λ.sub.s ≦1×10.sup.-6.
Claim 5
Dependent Claim
22 words
The magnetic material as set forth in claim 1, wherein the intensity of the applied magnetic field is 1 Oe or more.
Claim 6
Dependent Claim
23 words
The magnetic material as set forth in claim 4, wherein the intensity of the applied magnetic field is preferably 10 Oe or more.
Claim 7
Dependent Claim
19 words
The magnetic material as set forth in claim 1, wherein the magnetic material is used for a noise filter.
Claim 8
Dependent Claim
128 words
A heat treated, high permeability magnetic material in the form of a ribbon having a thickness of 5 to 25 μm consisting essentially of a Co-based amorphous alloy with a Curie temperature Tc of 120° C.≦Tc≦270° C., wherein said material has been heat treated to increase the permeability of said material by heating at a temperature below the Curie temperature and within a magnetic field applied transverse to the axis of said ribbon and wherein said Co-based amorphous alloy is expressed as (Co.sub.1-a-b Fe.sub.a M.sub.b).sub.100-z (Si.sub.1-y B.sub.y).sub.z where M denotes at least one of Ti, V, Cr, Mn, Ni, Cu, Zer, Nb, Mo, Hf, Ta, W and a platinum group metal, and a, b, y and z are constats expressed by atomic ratio by 0.02≦a≦0.08 0≦b≦0.04 0.3≦y≦0.5 25≦z≦32.
Claim 9
Dependent Claim
128 words
A heat treated, high permeability magnetic material in the form of a ribbon having a thickness of 5 to 25 μm consisting essentially of a Co-based amorphous alloy with a Curie temperature Tc of 120° C.≦Tc≦270° C., wherein said material has been heat treated to increase the permeability of said material by heating at a temperature below the Curie temperature and within a magnetic field applied transverse to the axis of said ribbon and wherein said Co-based amorphous alloy is expressed as (Co.sub.1-a-b Fe.sub.a M.sub.b).sub.100-z (Si.sub.1-y B.sub.y).sub.z where M denotes at least one of Ti, V, Cr, Mn, Ni, Cu, Zer, Nb, Mo, Hf, Ta, W and a platinum group metal, and a, b, y and z are constats expressed by atomic ratio by 0.02≦a≦0.08 0≦b≦0.04 0.3≦y≦0.5 25≦z≦32.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |