US5243316A
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Magnetoresistance effect element
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1992-01-22
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Granted: 1993-09-07
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Expires: 2012-01-22
Abstract
Abstract There is provided a magnetoresistance effect element which is a multilayer structure body wherein a first magnetic film layer made of Ni-rich Ni-Co-Fe having a thickness of 10 to 100 Å and a second magnetic film layer made of Co-rich Co-Ni-Fe having a thickness of 10 to 100 Å, which are different from each other in coercive force, are integrally laminated with a non-magnetic metal film layer having a thickness of 10 to 100 Å interposed therebetween. The non-magnetic metal film layer is of a metal, for example, Cu, Ag, Au, Pt, Ru or Re. (Ni A Co 1-A ) B Fe 1-B , Ni A Fe 1-A or Ni A Co 1-A is used as a material of the first magnetic film, and (Co C Ni 1-C ) D Fe 1-D is used as a material of the second magnetic film.
Inventors
- 👤 Hiroshi Sakakima
- 👤 Mitsuo Satomi
- 👤 Toshio Takada
- 👤 Teruya Shinjo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:16
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/142; B; B82; B82Y; B82Y10/00; B82Y25/00; G01R; G01R33/00; G01R33/02; G01R33/06; G01R33/09; G01R33/093; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; H; H01; H01F; H01F10/00; H01F10/32; H01F10/324; H01F10/3268; H01F10/3281; H10; H10N; H10N50/00; H10N50/80; H10N50/85; G11B2005/3996; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12465; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12931; Y10T428/12944
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
81 words
A magnetoresistance effect element comprising a first magnetic film layer having a thickness of 10 to 100 Å, a second magnetic film layer having a thickness of 10 to 100 Å whose coercive force is different from that of said first film layer, and a non-magnetic metal film layer having a thickness of 10 to 100 Å interposed between said first and second film layers, said first and second magnetic film layers and said non-magnetic metal film layer being integrally laminated.
Claim 2
Dependent Claim
81 words
A magnetoresistance effect element comprising a first magnetic film layer having a thickness of 10 to 100 Å, a second magnetic film layer having a thickness of 10 to 100 Å whose coercive force is different from that of said first film layer, and a non-magnetic metal film layer having a thickness of 10 to 100 Å interposed between said first and second film layers, said first and second magnetic film layers and said non-magnetic metal film layer being integrally laminated.
Claim 3
Dependent Claim
41 words
A magnetoresistance effect element according to claim 1, wherein said three film layers is a basic unit, and a plurality of such units are integrally laminated with non-magnetic metal film layers having a thickness of 10 to 100 Å interposed therebetween.
Claim 4
Dependent Claim
156 words
A magnetoresistance effect element comprising: a first magnetic film layer being formed of a material whose primary component is of a compound which satisfies the expression (Ni A Co 1-A ) B Fe 1-B (A and B designate atomic composition ratios which satisfy 0.6≦A≦1.0, 0.7≦B≦1.0, respectively), and having a thickness of 10 to 100 Å; a second magnetic film layer being formed of a material whose primary component is of a compound which satisfies the expression (Co C Ni 1-C ) D Fe 1-D (C and D designate atomic composition ratios which satisfy 0.4≦C≦1.0, 0.8≦D≦1.0, respectively), and having a thickness of 10 to 100 Å whose coercive force is different from that of said first film layer; and a non-magnetic metal film layer having a thickness of 10 to 100 Å interposed between said first and second magnetic film layers; said first and second magnetic film layers and said non-magnetic metal film layer being integrally laminated.
Claim 5
Dependent Claim
156 words
A magnetoresistance effect element comprising: a first magnetic film layer being formed of a material whose primary component is of a compound which satisfies the expression (Ni A Co 1-A ) B Fe 1-B (A and B designate atomic composition ratios which satisfy 0.6≦A≦1.0, 0.7≦B≦1.0, respectively), and having a thickness of 10 to 100 Å; a second magnetic film layer being formed of a material whose primary component is of a compound which satisfies the expression (Co C Ni 1-C ) D Fe 1-D (C and D designate atomic composition ratios which satisfy 0.4≦C≦1.0, 0.8≦D≦1.0, respectively), and having a thickness of 10 to 100 Å whose coercive force is different from that of said first film layer; and a non-magnetic metal film layer having a thickness of 10 to 100 Å interposed between said first and second magnetic film layers; said first and second magnetic film layers and said non-magnetic metal film layer being integrally laminated.
Claim 6
Dependent Claim
24 words
A magnetoresistance effect element according to claim 3, wherein said non-magnetic metal film layer is formed of Cu, Ag, Au, Pt, Ru or Re.
Claim 7
Dependent Claim
149 words
A magnetoresistance effect element comprising: a first magnetic film layer being formed of a material whose primary component is of a compound which satisfies the expression (Ni A Fe 1-A ) (A designates an atomic composition ratio which satisfies 0.7≦A≦0.9), and having a thickness of 10 to 100Å; a second magnetic film layer being formed of a material whose primary component is of a compound which satisfies the expression (Co C Ni 1-C ) D Fe 1-D (C and D designate atomic composition ratios which satisfy 0.4≦C≦1.0, 0.8≦D≦1.0, respectively), and having a thickness of 10 to 100 Å whose coercive force is different from that of said first film layer; and a non-magnetic metal film layer having a thickness of 10 to 100 Å interposed between said first and second magnetic film layers; said first and second magnetic film layers and said non-magnetic metal film layer being integrally laminated.
Claim 8
Dependent Claim
149 words
A magnetoresistance effect element comprising: a first magnetic film layer being formed of a material whose primary component is of a compound which satisfies the expression (Ni A Fe 1-A ) (A designates an atomic composition ratio which satisfies 0.7≦A≦0.9), and having a thickness of 10 to 100Å; a second magnetic film layer being formed of a material whose primary component is of a compound which satisfies the expression (Co C Ni 1-C ) D Fe 1-D (C and D designate atomic composition ratios which satisfy 0.4≦C≦1.0, 0.8≦D≦1.0, respectively), and having a thickness of 10 to 100 Å whose coercive force is different from that of said first film layer; and a non-magnetic metal film layer having a thickness of 10 to 100 Å interposed between said first and second magnetic film layers; said first and second magnetic film layers and said non-magnetic metal film layer being integrally laminated.
Claim 9
Dependent Claim
24 words
A magnetoresistance effect element according to claim 5, wherein said non-magnetic metal film layer is formed of Cu, Ag, Au, Pt, Ru or Re.
Claim 10
Dependent Claim
150 words
A magnetoresistance effect element comprising: a first magnetic film layer being formed of a material whose primary component is of a compound which satisfies the expression (Ni A Co 1-A ) (A designates and atomic composition ratio which satisfies 0.6≦A≦0.9), and having a thickness of 10 to 100 Å; a second magnetic film layer being formed of a material whose primary component is of a compound which satisfies the expression (Co C Ni 1-C ) D Fe 1-D (C and D designate atomic composition ratios which satisfy 0.4≦C≦1.0, 0.8≦D≦1.0, respectively), and having a thickness of 10 to 100 Å whose coercive force is different from that of said first film layer; and a non-magnetic metal film layer having a thickness of 10 to 100 Å interposed between said first and second magnetic film layers; said first and second magnetic film layers and said non-magnetic metal film layer being integrally laminated.
Claim 11
Dependent Claim
150 words
A magnetoresistance effect element comprising: a first magnetic film layer being formed of a material whose primary component is of a compound which satisfies the expression (Ni A Co 1-A ) (A designates and atomic composition ratio which satisfies 0.6≦A≦0.9), and having a thickness of 10 to 100 Å; a second magnetic film layer being formed of a material whose primary component is of a compound which satisfies the expression (Co C Ni 1-C ) D Fe 1-D (C and D designate atomic composition ratios which satisfy 0.4≦C≦1.0, 0.8≦D≦1.0, respectively), and having a thickness of 10 to 100 Å whose coercive force is different from that of said first film layer; and a non-magnetic metal film layer having a thickness of 10 to 100 Å interposed between said first and second magnetic film layers; said first and second magnetic film layers and said non-magnetic metal film layer being integrally laminated.
Claim 12
Dependent Claim
24 words
A magnetoresistance effect element according to claim 7, wherein said non-magnetic metal film layer is formed of Cu, Ag, Au, Pt, Ru or Re.
Claim 13
Dependent Claim
93 words
A magnetoresistance effect element comprising: a first magnetic film layer having a thickness of 10 to 100 Å; a second magnetic film layer having a thickness of 10 to 100 Å whose coercive force is different from that of said first film layer; and a non-magnetic metal film layer being formed of Cu, Ag, Au, Pt, Ru or Re and having a thickness of 10 to 100 Å interposed between said first and second magnetic film layers, said first and second magnetic film layers and said non-magnetic metal film layer being integrally laminated.
Claim 14
Dependent Claim
93 words
A magnetoresistance effect element comprising: a first magnetic film layer having a thickness of 10 to 100 Å; a second magnetic film layer having a thickness of 10 to 100 Å whose coercive force is different from that of said first film layer; and a non-magnetic metal film layer being formed of Cu, Ag, Au, Pt, Ru or Re and having a thickness of 10 to 100 Å interposed between said first and second magnetic film layers, said first and second magnetic film layers and said non-magnetic metal film layer being integrally laminated.
Claim 15
Dependent Claim
41 words
A magnetoresistance effect element according to claim 9, wherein said three film layers is a basic unit, and a plurality of such units are integrally laminated with non-magnetic metal film layers having a thickness of 10 to 100 Å interposed therebetween.
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) | 1996-09-06 | 1997-03-08 | 1997-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-06 | 2001-03-08 | 2001-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-06 | 2005-03-08 | 2005-09-07 | $7700.00 | Window Closed / Lapsed |