Patent US4130847A successfully refreshed from Google Patents.
US4130847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant thin film head assembly and method for making
Assignee: International Business Machines Corp
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Filing: 1977-03-31
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Granted: 1978-12-19
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Expires: 1997-03-31
Abstract
Abstract A slider element includes a thin film transducer deposited onto a slider along at least one of the rails forming the flying air bearing surface with a magnetic media. A portion of the end tips of the pole pieces and gap of the thin film inductive transducer and a portion of the slider rail adjacent to the transducer is etched by a sputter etching process. A layer of a passivation material such as chromium is sputter deposited into the etched portion such that the leading portion of the rail protects the passivation material from wear. The passivation material over the pole tips of the transducer prevents the corrosion of the iron-nickel alloy comprising the pole tips.
Inventors
- 👤 Nephi L. Head
- 👤 Robert D. Hempstead
- 👤 Thomas N. Kennedy
- 👤 Fred Y. Lieu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:01
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3103; G11B5/3106; G11B5/187; G11B5/1871
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
A magnetic head assembly comprising: a slider support having a bearing surface for close association with a magnetic media; a transducer assembly including at least one film magnetic layer and at least one electrically conductive film layer together with means to activate each conductive layer and having an active face for a transducing action with a magnetic transition from the magnetic media in relative movement therewith, said transducer assembly fastened to said slider support adjacent to its bearing surface, said transducer assembly and a portion of the bearing surface of said slider support adjacent to said transducer assembly being recessed; and a film layer of a passivation material covering the active face of said transducer assembly and the recess portion, said film layer being protected from excessive contact with the media by the unrecessed portion of the bearing surface of the slider support.
Claim 2
Dependent Claim
143 words
A magnetic head assembly comprising: a slider support having a bearing surface for close association with a magnetic media; a transducer assembly including at least one film magnetic layer and at least one electrically conductive film layer together with means to activate each conductive layer and having an active face for a transducing action with a magnetic transition from the magnetic media in relative movement therewith, said transducer assembly fastened to said slider support adjacent to its bearing surface, said transducer assembly and a portion of the bearing surface of said slider support adjacent to said transducer assembly being recessed; and a film layer of a passivation material covering the active face of said transducer assembly and the recess portion, said film layer being protected from excessive contact with the media by the unrecessed portion of the bearing surface of the slider support.
Claim 3
Dependent Claim
49 words
A magnetic head assembly as defined in claim 1 wherein said transducer assembly comprises a plurality of thin film magnetic layers and at least one electrically conductive layer together with means to activate each conductive layer to inductively drive said magnetic layers for transducing action with the magnetic media.
Claim 4
Dependent Claim
25 words
A magnetic head assembly as defined in claim 1 wherein said transducer assembly includes a magnetoresistive element to sense magnetic transitions from said magnetic media.
Claim 5
Dependent Claim
22 words
A magnetic head assembly as defined in claim 1 wherein said film layer of a passivation material is a layer of chromium.
Claim 6
Dependent Claim
48 words
A magnetic head assembly as defined in claim 1 wherein said slider support includes a plurality of rails forming an air bearing surface for flying said slider support in relation to the magnetic media, with said transducer assembly being longitudinally aligned with at least one of said rails.
Claim 7
Dependent Claim
158 words
A magnetic head assembly comprising: a slider body including downwardly depending longitudinal rails having bottom surfaces that are laterally spaced apart to form an air bearing surface; at least one transducer assembly including at least one thin film magnetic layer and at least one electrically conductive film layer together with means to activate each conductive layer and having an active face for transducing information upon a magnetic recording surface during relative movement therebetween and each longitudinally aligned with one rail and fastened at the trailing edge of said slider body, each transducer assembly and its associated rail portion adjacent to the active face of the transducer assembly being recessed from the air bearing surface; and a film layer of a passivation material covering each active face of the transducer assembly and its associated rail in the recessed portion, said film layer being protected from excessive contact with the media by the unrecessed portion of the air bearing surface.
Claim 8
Dependent Claim
158 words
A magnetic head assembly comprising: a slider body including downwardly depending longitudinal rails having bottom surfaces that are laterally spaced apart to form an air bearing surface; at least one transducer assembly including at least one thin film magnetic layer and at least one electrically conductive film layer together with means to activate each conductive layer and having an active face for transducing information upon a magnetic recording surface during relative movement therebetween and each longitudinally aligned with one rail and fastened at the trailing edge of said slider body, each transducer assembly and its associated rail portion adjacent to the active face of the transducer assembly being recessed from the air bearing surface; and a film layer of a passivation material covering each active face of the transducer assembly and its associated rail in the recessed portion, said film layer being protected from excessive contact with the media by the unrecessed portion of the air bearing surface.
Claim 9
Dependent Claim
49 words
A magnetic head assembly as defined in claim 6 wherein said transducer assembly comprises a plurality of thin film magnetic layers and at least one electrically conductive layer together with means to activate each conductive layer to inductively drive said magnetic layers for transducing action with the magnetic media.
Claim 10
Dependent Claim
25 words
A magnetic head assembly as defined in claim 6 wherein said transducer assembly includes a magnetoresistive element to sense magnetic transitions from said magnetic media.
Claim 11
Dependent Claim
22 words
A magnetic head assembly as defined in claim 6 wherein said film layer of a passivation material is a layer of chromium.
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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) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |