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US5585196A
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Magnetoresistance effect element
Assignee: Toshiba Corp
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Filing: 1994-03-11
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Granted: 1996-12-17
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Expires: 2014-03-11
Abstract
Abstract There is disclosed a magnetoresistance effect element including a multilayer constituted by a magnetic layers in which fine magnetic metal particles of crystalline or amorphous containing at least one element of Fe, Co, and Ni are dispersed in a matrix containing at least one element selected from the group consisting of noble metals and Cu, and non-magnetic layers containing a noble metal.
Inventors
- 👤 Koichiro Inomata
- 👤 Yoshinori Takahashi
- 👤 Shiho Okuno
- 👤 Yoshiaki Saito
- 👤 Keiichiro Yusu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:25
CPC Classifications
B; B82; B82Y; B82Y25/00; G; G01; G01R; G01R33/00; G01R33/02; G01R33/06; G01R33/09; G01R33/093; H; H01; H01F; H01F10/00; H01F10/007; H01F10/32; H01F10/3227; H10; H10N; H10N50/00; H10N50/80; H10N50/85; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/11; Y10T428/1107; Y10T428/1121; Y10T428/1129; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12097; Y10T428/12104; Y10T428/12111; Y10T428/12118; Y10T428/12465; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12882; Y10T428/12903; Y10T428/1291; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
90 words
A multilayer magnetoresistance effect element comprising one magnetic layer in which flat-shaped magnetic metal particles having an aspect ratio within the range of 5 to 50, a major axis of not more than 200 Å, and containing at least one element selected from the group consisting of Fe, Co, and Ni are dispersed in a matrix containing at least one element selected from the group consisting of noble metals and Cu, and at least one non-magnetic layer containing a metal selected from the group consisting of noble metals and Cu.
Claim 2
Dependent Claim
90 words
A multilayer magnetoresistance effect element comprising one magnetic layer in which flat-shaped magnetic metal particles having an aspect ratio within the range of 5 to 50, a major axis of not more than 200 Å, and containing at least one element selected from the group consisting of Fe, Co, and Ni are dispersed in a matrix containing at least one element selected from the group consisting of noble metals and Cu, and at least one non-magnetic layer containing a metal selected from the group consisting of noble metals and Cu.
Claim 3
Dependent Claim
16 words
The multilayer element according to claim 1, wherein the magnetic metal particles are crystalline or amorphous.
Claim 4
Dependent Claim
16 words
The multilayer element according to claim 1, wherein the magnetic metal particles have substantially zero magnetostriction.
Claim 5
Dependent Claim
35 words
The multilayer element according to claim 3, wherein the magnetic metal particles are crystalline having an alloy composition consisting of about 78.5% Ni, 21.5% Fe, and trace amounts of C, Si, CO, Cu, and Mn.
Claim 6
Dependent Claim
57 words
The multilayer element according to claim 4, wherein the magnetic metal particles have a composition represented by (Ni x Fe y Co z ) a X 100-a , where x=0-0.10, y=0.04-0.10, z=0.90-0.94, x+y+z=1, a=65-90, and X is at least one of the elements selected from the group consisting of Nb, Zr, Hf, Si, B, C and P.
Claim 7
Dependent Claim
26 words
The multilayer element according to claim 1, wherein each of the magnetic metal particles has a major axis within a range of 50 to 200 Å.
Claim 8
Dependent Claim
27 words
The multilayer element according to claim 1, wherein the noble metal matrix contains at least one element selected from the group consisting of Cu, Ag, and Au.
Claim 9
Dependent Claim
18 words
The multilayer element according to claim 1, wherein the magnetic metal particles are induced with a uniaxial anisotropy.
Claim 10
Dependent Claim
26 words
The multilayer element according to claim 1, wherein said non-magnetic layer contains at least one element selected from the group consisting of Cu, Ag, and Au.
Claim 11
Dependent Claim
19 words
The multilayer element according to claim 1, wherein said magnetic layer has a thickness of 5 to 200 Å.
Claim 12
Dependent Claim
19 words
The multilayer element according to claim 1, wherein said non-magnetic layer has a thickness of 10 to 100 Å.
Claim 13
Dependent Claim
40 words
A multilayer magnetoresistance effect element according to claim 1, comprising at least one first magnetic layer and at least one second magnetic layer, said second magnetic layer having a saturation magnetic field smaller than that of said first magnetic layer.
Claim 14
Dependent Claim
94 words
A multilayer magnetoresistance effect element comprising one first magnetic layer in which flat-shaped magnetic metal particles having an aspect ratio within the range of 5 to 50, a major axis of not more than 200 Å, and containing at least one element selected from the group consisting of Fe, Co, and Ni are dispersed in a matrix containing at least one element selected from the group consisting of noble metals and Cu, and at least one second magnetic layer containing at least one element selected from the group consisting of Fe, Co, and Ni.
Claim 15
Dependent Claim
94 words
A multilayer magnetoresistance effect element comprising one first magnetic layer in which flat-shaped magnetic metal particles having an aspect ratio within the range of 5 to 50, a major axis of not more than 200 Å, and containing at least one element selected from the group consisting of Fe, Co, and Ni are dispersed in a matrix containing at least one element selected from the group consisting of noble metals and Cu, and at least one second magnetic layer containing at least one element selected from the group consisting of Fe, Co, and Ni.
Claim 16
Dependent Claim
16 words
The multilayer element according to claim 13, wherein the magnetic metal particles are crystalline or amorphous.
Claim 17
Dependent Claim
16 words
The multilayer element according to claim 13, wherein the magnetic metal particles have substantially zero magnetostriction.
Claim 18
Dependent Claim
35 words
The multilayer element according to claim 15, wherein the magnetic metal particles are crystalline having an alloy consisting essentially of about 78.5% Ni, 21.5% Fe, and trace amounts of C, Si, Co, Cu, and Mn.
Claim 19
Dependent Claim
57 words
The multilayer element according to claim 15, wherein the magnetic metal particles have a composition represented by (Ni x Fe y Co z ) a X 100-a , where x=0-0.10, y=0.04-0.10, z=0.90-0.94, x+y+z=1, a=65-90, and X is at least one of the elements selected from the group consisting of Nb, Zr, Hf, Si, B, C and P.
Claim 20
Dependent Claim
27 words
The multilayer element according to claim 13, wherein each of the magnetic metal particles has a major axis falling within a range of 50 to 200 Å.
Claim 21
Dependent Claim
27 words
The multilayer element according to claim 13, wherein the noble metal matrix contains at least one element selected from the group consisting of Cu, Ag, and Au.
Claim 22
Dependent Claim
18 words
The multilayer element according to claim 13, wherein the magnetic metal particles are induced with a uniaxial anisotropy.
Claim 23
Dependent Claim
23 words
The multilayer element according to claim 13, wherein said at least one first magnetic layer has a thickness of 5 to 200 Å.
Claim 24
Dependent Claim
23 words
The multilayer element according to claim 15, wherein said at least one second magnetic layer has a thickness of 20 to 300 Å.
Claim 25
Dependent Claim
33 words
A multilayer magnetoresistance effect element according to claim 13, wherein said at least one second magnetic layer has a saturation magnetic field smaller than that of said at least one first magnetic layer.
Claim 26
Dependent Claim
38 words
The multilayer element according to claim 23, wherein the non-magnetic metal matrix of said at least one first magnetic layer contains at least one element selected from the group consisting of Cu, Ag, Au, Cr, Al, and Ru.
Claim 27
Dependent Claim
28 words
The multilayer element according to claim 23, wherein said at least one second magnetic layer contains one of a transition metal and an alloy containing a transition metal.
Claim 28
Dependent Claim
73 words
The multilayer element according to claim 25, wherein said at least one second magnetic layer is formed by one alloy selected from the group consisting of an alloy consisting essentially of about 78.5% Ni, 21.5% Fe, and trace amounts of C, Si, Co, Cu, and Mn, an alloy consisting essentially of 79% Ni, 15% Fe, 5% Mo and 0.5% Mn, and an alloy consisting essentially of 5% Al, 10% Si, and 85% Fe.
Claim 29
Dependent Claim
23 words
The multilayer element according to claim 23, wherein said at least one first magnetic layer has a thickness of 10 to 100 Å.
Claim 30
Dependent Claim
23 words
The multilayer element according to claim 23, wherein said at least one second magnetic layer has a thickness of 5 to 1,000 Å.
Claim 31
Dependent Claim
14 words
The multilayer element according to claim 23, comprising a plurality of first magnetic layers.
Claim 32
Dependent Claim
14 words
The multilayer element according to claim 29, comprising a plurality of second magnetic layers.
Claim 33
Dependent Claim
23 words
The multilayer element according to claim 30, wherein said plurality of first magnetic layers and plurality of second magnetic layers are alternately stacked.
Claim 34
Dependent Claim
16 words
The multilayer element according to claim 23, wherein the magnetic metal particles have substantially zero magnetostriction.
Claim 35
Dependent Claim
26 words
The multilayer element according to claim 23, wherein each of the magnetic metal particles has a major axis within a range of 50 to 200 Å.
Claim 36
Dependent Claim
18 words
The multilayer element according to claim 23, wherein the magnetic metal particles are induced with a uniaxial anisotropy.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-17 | 2000-06-17 | 2000-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-17 | 2004-06-17 | 2004-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-17 | 2008-06-17 | 2008-12-17 | $7700.00 | Window Closed / Lapsed |