US4828966A
Expired / Lapsed
US
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Method for producing hall effect sensor for magnetic recording head
Assignee: Maxtor Corp
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Filing: 1987-12-04
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Granted: 1989-05-09
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Expires: 2007-12-04
Abstract
Abstract A method of forming a Hall effect sensor for a magnetic recording head including the steps of providing a single crystal substrate having a chemically dissimilar single crystal film thereon, providing a ceramic substrate having a first magnetic pole piece of a selected thickness formed on a surface thereof, positioning the single crystal substrate and the ceramic substrate with the single crystal film and magnetic pole piece surfaces in an opposing relationship, bonding the positioned ceramic substrate to the single crystal film on the positioned single crystal substrate to form a laminated structure having a substantially thin uniform bond line, removing chemically the single crystal substrate from the single crystal film, forming a Hall effect pattern in the film while one surface of the film is exposed, and depositing a second magnetic pole piece on the formed Hall effect pattern.
Inventors
- 👤 Michael Mallary
- 👤 Christine Bisagni
- 👤 Shu-Huei Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:26
CPC Classifications
H; H10; H10N; H10N52/00; H10N52/01; G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3163; G11B5/33; G11B5/37; G11B5/372; G11B5/374; G11B5/376
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
140 words
A method of forming a Hall effect sensor for a magnetic recording head comprising the steps of: providing a single crystal substrate having a chemically dissimilar single crystal film thereon; providing a ceramic substrate having a first magnetic pole piece of a selected thickness formed on a surface thereof; positioning the single crystal substrate and the ceramic substrate with the single crystal film and magnetic pole piece surfaces in an opposing relationship; bonding the positioned ceramic substrate to the single crystal film on the positioned single crystal substrate to form a laminated structure having a substantially uniform thin bond line; removing chemically the single crystal substrate from the single crystal film; forming a Hall effect pattern in the film while one surface of the film is exposed; and depositing a second magnetic ole piece on the formed Hall effect pattern.
Claim 2
Independent Claim
140 words
A method of forming a Hall effect sensor for a magnetic recording head comprising the steps of: providing a single crystal substrate having a chemically dissimilar single crystal film thereon; providing a ceramic substrate having a first magnetic pole piece of a selected thickness formed on a surface thereof; positioning the single crystal substrate and the ceramic substrate with the single crystal film and magnetic pole piece surfaces in an opposing relationship; bonding the positioned ceramic substrate to the single crystal film on the positioned single crystal substrate to form a laminated structure having a substantially uniform thin bond line; removing chemically the single crystal substrate from the single crystal film; forming a Hall effect pattern in the film while one surface of the film is exposed; and depositing a second magnetic ole piece on the formed Hall effect pattern.
Claim 3
Dependent Claim
50 words
The method according to claim 1, wherein the step of providing the single crystal substrate comprises the substep of: depositing a single crystal film on a single crystal substrate, said single crystal substrate being soluble in a selected chemical, said single crystal film being substantially insoluble in said selected chemical.
Claim 4
Dependent Claim
24 words
The method according to claim 2, wherein said single crystal film is InSb and said single crystal substrate is one of InP and AlGaAs/GaAs.
Claim 5
Dependent Claim
83 words
The method according to claim 1, wherein the step of bonding the positioned ceramic substrate to the single crystal film on the positioned single crystal substrate comprises the substeps of: applying an adhesive layer to one of said surfaces having the first magnetic pole piece and said single crystal film; squeezing the positioned substrates together with a force sufficient to remove excess adhesive between the opposing surfaces for forming a bond line of adhesive; and curing the adhesive for bonding the positioned substrates.
Claim 6
Dependent Claim
12 words
The method according to claim 4, wherein said adhesive is an epoxy.
Claim 7
Dependent Claim
37 words
The method according to claim 4, wherein said adhesive is selected from the group consisting of a low viscosity organic material, a low melting point glass, and low melting point metal, and a low melting point alloy.
Claim 8
Dependent Claim
41 words
The method according to claim 1, wherein the step of removing the single crystal substrate comprises the substep of: etching the single crystal substrate away with a selective etchant effective to dissolve the substrate without significantly dissolving the single crystal film.
Claim 9
Dependent Claim
56 words
The method according to claim 1, wherein the step of providing the ceramic substrate comprises the substep of forming a patterned magnetic pole piece on the surface of the ceramic substrate, and the step of forming the Hall effect pattern is performed after the step of removing the single crystal substrate from the single crystal film.
Claim 10
Dependent Claim
38 words
The method according to claim 1, wherein the step of forming the Hall effect pattern is performed prior to the step of bonding the positioned ceramic substrate to the single crystal film on the positioned single crystal substrate.
Claim 11
Independent Claim
147 words
A method of forming a Hall effect sensor for a magnetic recording head comprising the steps of: providing a single crystal substrate having a chemically dissimilar single crystal film thereon; providing a ceramic substrate having a first magnetic pole piece of a selected thickness formed on a surface thereof; positioning the single crystal substrate and the ceramic substrate with the single crystal film and magnetic pole piece surfaces in an opposing relationship; bonding the positioned ceramic substrate to the single crystal film on the positioned single crystal substrate to form a laminated structure having a substantially uniform thin bond line; removing chemically the single crystal substrate from the single crystal film; forming a Hall effect pattern in the film by ion milling with a photoresist pattern while one surface of the film is exposed; and depositing a second magnetic pole piece on the formed Hall effect pattern.
Claim 12
Independent Claim
147 words
A method of forming a Hall effect sensor for a magnetic recording head comprising the steps of: providing a single crystal substrate having a chemically dissimilar single crystal film thereon; providing a ceramic substrate having a first magnetic pole piece of a selected thickness formed on a surface thereof; positioning the single crystal substrate and the ceramic substrate with the single crystal film and magnetic pole piece surfaces in an opposing relationship; bonding the positioned ceramic substrate to the single crystal film on the positioned single crystal substrate to form a laminated structure having a substantially uniform thin bond line; removing chemically the single crystal substrate from the single crystal film; forming a Hall effect pattern in the film by ion milling with a photoresist pattern while one surface of the film is exposed; and depositing a second magnetic pole piece on the formed Hall effect pattern.
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) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |