US4939837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Batch fabrication process for magnetic heads
Assignee: International Business Machines Corp
•
Filing: 1988-09-01
•
Granted: 1990-07-10
•
Expires: 2008-09-01
Abstract
Abstract A process for the batch fabrication of an array of shielded magnetoresistive (MR) read transducers comprising the steps of depositing a full film over the entire substrate of a first magnetic shield layer, a first non-magnetic gap layer and sputter depositing a layer of MR sensor material in the presence of a magnetic field for orienting the anisotropy axes of the layers of MR sensor material in a chosen direction. The MR sensor layer and the first gap layer are permitted to produce a plurality of MR read transducers, and the first magnetic shield layer is then patterned to produce a first shield for each of the MR read transducers. A second gap layer and a second shield layer are patterned to produce a second shield for each of the MR read transducers.
Inventors
- 👤 Mohamad T. Krounbi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:02
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49034; Y10T29/49036; Y10T29/49043; Y10T29/49044; Y10T29/49046
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
193 words
The method for batch fabrication of a plurality of magnetic heads each comprising a magnetoresistive (MR) read transducer, said magnetic heads being formed in a plurality of rows on a substrate, each of said rows having a plurality of magnetic heads therein, said method comprising the steps of: depositing a first layer of magnetic material over the substrate of a predetermined thickness; depositing a layer of suitable electrically insulating material of a predetermined thickness over said first layer of magnetic material; sputter depositing, in the presence of a magnetic field, a second layer of magnetic material of a predetermined thickness over said layer of electrically insulating material, said magnetic field being operable to orient said second layer of magnetic material in a preferred direction; patterning said second layer of magnetic material to form a plurality of MR read transducers, each having its easy axis in a selected direction; and then patterning said first layer of magnetic material to form a shield for each of said MR read transducers whereby said thickness and said preferred orientation of said MR transducers is maintained at the thickness and direction, respectively, established during said sputter depositing step.
Claim 2
Independent Claim
193 words
The method for batch fabrication of a plurality of magnetic heads each comprising a magnetoresistive (MR) read transducer, said magnetic heads being formed in a plurality of rows on a substrate, each of said rows having a plurality of magnetic heads therein, said method comprising the steps of: depositing a first layer of magnetic material over the substrate of a predetermined thickness; depositing a layer of suitable electrically insulating material of a predetermined thickness over said first layer of magnetic material; sputter depositing, in the presence of a magnetic field, a second layer of magnetic material of a predetermined thickness over said layer of electrically insulating material, said magnetic field being operable to orient said second layer of magnetic material in a preferred direction; patterning said second layer of magnetic material to form a plurality of MR read transducers, each having its easy axis in a selected direction; and then patterning said first layer of magnetic material to form a shield for each of said MR read transducers whereby said thickness and said preferred orientation of said MR transducers is maintained at the thickness and direction, respectively, established during said sputter depositing step.
Claim 3
Dependent Claim
69 words
The method of claim 1 additionally comprising depositing a second layer of suitable electrically insulating material of a predetermined thickness over said second layer of magnetic material; depositing a third layer of magnetic material over said second layer of magnetic material; and patterning said second layer of electrically insulating material and said third layer of magnetic material to form a second shield for each of said MR read transducers.
Claim 4
Dependent Claim
39 words
The method of claim 2 wherein said step of patterning said second layer of electrically insulating material and said third layer of magnetic material is carried out prior to the step of patterning the first layer of magnetic material.
Claim 5
Dependent Claim
20 words
The method of claim 2 comprising the additional step of separating said assembly into a plurality of individual magnetic heads.
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) | 1993-07-09 | 1994-01-08 | 1994-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-09 | 1998-01-08 | 1998-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-09 | 2002-01-08 | 2002-07-10 | $7700.00 | Window Closed / Lapsed |