US5337203A
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Magnetoresistive magnetic head
Assignee: HGST Japan Ltd
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Filing: 1992-04-27
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Granted: 1994-08-09
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Expires: 2012-04-27
Abstract
Abstract A magnetoresistive head having a structure based on a two-layer film having a first film exhibiting a magnetoresistive effect and a second film comprising Nb and at least one element selected from the group consisting of Ti, Cr, Mo, Zr, W, Pt, Re, V, Hf, Ta, Rh, Ni and Ru as an additive element.
Inventors
- 👤 Masahiro Kitada
- 👤 Hideo Tanabe
- 👤 Noboru Shimizu
- 👤 Naoki Koyama
- 👤 Toshio Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:31
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; H; H10; H10N; H10N50/00; H10N50/10; H10N50/80; H10N50/85; G11B2005/3996; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
90 words
A magnetoresistive head having a two-layer film and a pair of spaced electrodes for supplying current to said two-layered film, said two-layered film comprising a magnetoresistive film exhibiting a magnetoresistive effect and a shunt film provided adjacent said magnetoresistive film at least at a magnetosensitive region between said spaced electrodes for applying a bias magnetic field, said shunt film comprising Nb and at least one element, as an additive element, selected from the group consisting of Ti, Cr, Mo, Zr, W, Pt, Re, V, Hf, Ta, Rh, Ni and Ru.
Claim 2
Dependent Claim
90 words
A magnetoresistive head having a two-layer film and a pair of spaced electrodes for supplying current to said two-layered film, said two-layered film comprising a magnetoresistive film exhibiting a magnetoresistive effect and a shunt film provided adjacent said magnetoresistive film at least at a magnetosensitive region between said spaced electrodes for applying a bias magnetic field, said shunt film comprising Nb and at least one element, as an additive element, selected from the group consisting of Ti, Cr, Mo, Zr, W, Pt, Re, V, Hf, Ta, Rh, Ni and Ru.
Claim 3
Dependent Claim
32 words
A magnetoresistive head as defined in claim 1, wherein the magnetoresistive film comprises a Ni-Fe alloy in which the composition thereof ranges between Ni-7 at. % Fe and Ni-27 at. % Fe.
Claim 4
Dependent Claim
32 words
A magnetoresistive head as defined in claim 1, wherein the magnetoresistive film comprises a Ni-Co alloy in which the composition thereof ranges between Ni-30 at. % Co and Ni-50 at. % Co.
Claim 5
Dependent Claim
34 words
A magnetoresistive head as defined in claim 1, wherein the magnetoresistive film comprises a Ni-Fe-Co alloy in which the composition comprises 3-18 at. % Fe, 3-15 at. % Co and the balance of Ni.
Claim 6
Dependent Claim
27 words
A magnetoresistive head as defined in claim 1, wherein the shunt film is a Nb-Mo alloy and the Mo content is from 3 to 8 at. %.
Claim 7
Dependent Claim
27 words
A magnetoresistive head as defined in claim 1, wherein a third film exhibiting a soft magnetic property is stacked on the magnetoresistive film via the shunt film.
Claim 8
Dependent Claim
20 words
A magnetoresistive head as defined in claim 1, wherein the Nb alloy of the shunt film is a solid solution.
Claim 9
Dependent Claim
27 words
A magnetoresistive head as defined in claim 1, wherein the shunt film is a Nb-Ti alloy and the Ti content is from 1 to 25 at. %.
Claim 10
Dependent Claim
27 words
A magnetoresistive head as defined in claim 1, wherein the shunt film is a Nb-Zr alloy and the Zr content is from 0.5 to 10 at. %.
Claim 11
Dependent Claim
27 words
A magnetoresistive head as defined in claim 1, wherein the shunt film is a Nb-V alloy and the V content is from 3 to 20 at. %.
Claim 12
Dependent Claim
27 words
A magnetoresistive head as defined In claim 1, wherein the shunt film is a Nb-Hf alloy and the Hf content is from 1 to 25 at. %.
Claim 13
Dependent Claim
27 words
A magnetoresistive head as defined in claim 1, wherein the shunt film is a Nb-W alloy and the W content is from 0.5 to 5 at. %.
Claim 14
Dependent Claim
27 words
A magnetoresistive head as defined in claim 1, wherein the shunt film is a Nb-Ta alloy and the Ta content is from 3 to 25 at. %.
Claim 15
Dependent Claim
27 words
A magnetoresistive head as defined in claim 1, wherein the shunt film is a Nb-Ru alloy and the Ru content is from 3 to 35 at. %.
Claim 16
Dependent Claim
27 words
A magnetoresistive head as defined in claim 1, wherein the shunt film is a Nb-Rh alloy and the Rh content is from 3 to 25 at. %.
Claim 17
Dependent Claim
27 words
A magnetoresistive head as defined in claim 1, wherein the shunt film is a Nb-Re alloy and the Re content is from 3 to 15 at. %.
Claim 18
Dependent Claim
27 words
A magnetoresistive head as defined in claim 1, wherein the shunt film is a Nb-Pt alloy and the Pt content is from 1 to 10 at. %.
Claim 19
Dependent Claim
27 words
A magnetoresistive head as defined in claim 1, wherein the shunt film is a Nb-Ni alloy and the Ni content is from 3 to 25 at. %.
Claim 20
Dependent Claim
27 words
A magnetoresistive head as defined in claim 1, wherein the shunt film is a Nb-Cr alloy and the Cr content is from 0.2 to 5 at. %.
Claim 21
Dependent Claim
112 words
A magnetoresistive head having a two-layer film and a pair of spaced electrodes for supplying current to said two-layer film; said two-layer film comprising a magnetoresistive film and a shunt film provided adjacent said magnetoresistive film at least at a magnetosensitive region between said spaced electrodes for applying a bias magnetic field, said shunt film containing Nb as the main ingredient and at least one element, as an additive element, selected from the group consisting of Cr, Mo, Zr, W, Pt, Re, V, Hf, Ta, Rh, Ni and Ru; wherein a magnetic field formed by a current shunted to said shunt film is applied as a bias field to said magnetoresistive film.
Claim 22
Dependent Claim
112 words
A magnetoresistive head having a two-layer film and a pair of spaced electrodes for supplying current to said two-layer film; said two-layer film comprising a magnetoresistive film and a shunt film provided adjacent said magnetoresistive film at least at a magnetosensitive region between said spaced electrodes for applying a bias magnetic field, said shunt film containing Nb as the main ingredient and at least one element, as an additive element, selected from the group consisting of Cr, Mo, Zr, W, Pt, Re, V, Hf, Ta, Rh, Ni and Ru; wherein a magnetic field formed by a current shunted to said shunt film is applied as a bias field to said magnetoresistive film.
Claim 23
Dependent Claim
122 words
A magnetoresistive head having a three-layer film and a pair of spaced electrodes for supplying current to said three-layer film, said three-layered film comprising a magnetoresistive film, a soft magnetic film, and an intermediate film provided between said magnetoresistive film and said soft magnetic film at least at a magnetosensitive region between said spaced electrodes for preventing sense current from shunting to said soft magnetic film, said intermediate film containing Nb as the main ingredient and at least one element, as an additive element, selected from the group consisting of Cr, Mo, Zr, W, Pt, Re, V, Hf, Ta, Rh, Ni and Ru, wherein a magnetic field by said soft magnetic film is applied as a bias field to said magnetoresistive film.
Claim 24
Dependent Claim
122 words
A magnetoresistive head having a three-layer film and a pair of spaced electrodes for supplying current to said three-layer film, said three-layered film comprising a magnetoresistive film, a soft magnetic film, and an intermediate film provided between said magnetoresistive film and said soft magnetic film at least at a magnetosensitive region between said spaced electrodes for preventing sense current from shunting to said soft magnetic film, said intermediate film containing Nb as the main ingredient and at least one element, as an additive element, selected from the group consisting of Cr, Mo, Zr, W, Pt, Re, V, Hf, Ta, Rh, Ni and Ru, wherein a magnetic field by said soft magnetic film is applied as a bias field to said magnetoresistive film.
Claim 25
Dependent Claim
106 words
A thin film material used for a magnetoresistive head containing Nb as the main ingredient and at least one additive element selected from the group consisting of less than 30 at. % Ti, less than 6 at. % Cr, less than 9 at. % Mo, less than 12 at. % Zr, less than 6 at. % W, less than 12 at. % Pt, less than 17 at. % Re, less than 22 at. % V, less than 27 at. % Hf, less than 27 at. % Ta, less than 27 at. % Rh, less than 25 at. % Ni and less than 37 at. % Ru.
Claim 26
Dependent Claim
106 words
A thin film material used for a magnetoresistive head containing Nb as the main ingredient and at least one additive element selected from the group consisting of less than 30 at. % Ti, less than 6 at. % Cr, less than 9 at. % Mo, less than 12 at. % Zr, less than 6 at. % W, less than 12 at. % Pt, less than 17 at. % Re, less than 22 at. % V, less than 27 at. % Hf, less than 27 at. % Ta, less than 27 at. % Rh, less than 25 at. % Ni and less than 37 at. % Ru.
Claim 27
Dependent Claim
26 words
A material as defined in claim 22, wherein the additive element is Mo contained by less than 9 at. % in view of the corrosion resistance.
Claim 28
Dependent Claim
26 words
A material as defined in claim 22, wherein the additive element is Ti contained by less than 30 at. % in view of the reaction resistance.
Claim 29
Dependent Claim
26 words
A material as defined in claim 22, wherein the additive element is Zr contained by less than 12 at. % in view of the corrosion resistance.
Claim 30
Dependent Claim
26 words
A material as defined in claim 22, wherein the additive element is V contained by less than 22 at. % in view of the reaction resistance.
Claim 31
Dependent Claim
26 words
A material as defined in claim 22, wherein the additive element is Hf contained by less than 27 at. % in view of the reaction resistance.
Claim 32
Dependent Claim
26 words
A material as defined in claim 22, wherein the additive element is W contained by less than 6 at. % in view of the corrosion resistance.
Claim 33
Dependent Claim
26 words
A material as defined in claim 22, wherein the additive element is Ta contained by less than 27 at. % in view of the reaction resistance.
Claim 34
Dependent Claim
26 words
A material as defined in claim 22, wherein the additive element is Ru contained by less than 37 at. % in view of the reaction resistance.
Claim 35
Dependent Claim
26 words
A material as defined an claim 22, wherein the additive element is Rh contained by less than 27 at. % in view of the reaction resistance.
Claim 36
Dependent Claim
26 words
A material as defined in claim 22, wherein the additive element is Re contained by less than 17 at. % in view of the reaction resistance.
Claim 37
Dependent Claim
26 words
A material as defined an claim 22, wherein the additive element is Pt contained by less than 12 at. % in view of the reaction resistance.
Claim 38
Dependent Claim
26 words
A material as defined an claim 22, wherein the additive element is Cr contained by less than 6 at. % in view of the reaction resistance.
References Cited (Backward Citations)
US4907114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-08 | 1998-02-07 | 1998-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-08 | 2002-02-07 | 2002-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-08 | 2006-02-07 | 2006-08-09 | $7700.00 | Window Closed / Lapsed |