EP0279536A2
Expired / Lapsed
EP
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Magnetoresistive head and process for its manufacture
Assignee: Seagate Technology International
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Filing: 1988-01-27
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Granted: —
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Expires: 2008-01-27
Abstract
Abstract A magnetoresistive head comprises a pair of inductive write poles (72,79) and a soft-magnetic shield (60) forming two gaps, a first gap between the poles, a second gap between a trailing one (72)of the poles and the shield, and a magnetoresistive sensor (64) having a central sense region mounted in the second gap. A leading one (79) of the poles has a length defining a track width, the central sense region being approximately the same length as the leading pole (79) and the trailing pole having a length at least as long as the sensor.
Inventors
- 👤 Greg Stephen Mowry
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 18:24
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
99 words
A magnetoresistive head comprising: a pair of inductive write poles (72,79) and a soft-magnetic shield (60) forming two gaps, a first gap between the poles, a second gap between a trailing one (72) of said poles and said shield (60); and a magnetoresistive sensor (64) having central sense region mounted in said second gap; characterised in that a leading one (70) of said poles has a length defining a track width, the central sense region is approximately the same length as the leading pole (79) and the trailing pole has a length at least as long as the sensor.
Claim 2
Dependent Claim
99 words
A magnetoresistive head comprising: a pair of inductive write poles (72,79) and a soft-magnetic shield (60) forming two gaps, a first gap between the poles, a second gap between a trailing one (72) of said poles and said shield (60); and a magnetoresistive sensor (64) having central sense region mounted in said second gap; characterised in that a leading one (70) of said poles has a length defining a track width, the central sense region is approximately the same length as the leading pole (79) and the trailing pole has a length at least as long as the sensor.
Claim 3
Dependent Claim
22 words
A head as claimed in claim 1 characterised in that the soft-magnetic shield (60) is at least as long as the sensor.
Claim 4
Dependent Claim
53 words
A head as claimed in claim 1 or 2 characterised by including two contacts (66) electrically contacting said sensor, one each on laterally opposite sides of said central sense region, a constant current source (88) connected between each of said contacts, and a voltage sensing circuit (90) connected between each of said contacts.
Claim 5
Dependent Claim
18 words
A head as claimed in any preceding claim characterised in that the magnetoresistive sensor has a pseudo-ellipsoid shape.
Claim 6
Dependent Claim
23 words
A head as claimed in claim 4 characterised in that the shape includes a flattened central sense region and lateral, pointed ends (12,14).
Claim 7
Dependent Claim
27 words
A head as claimed in claim 5 characterised in that exchange-biasing material (16,18) is atomically coupled to said lateral pointed ends, but not the central sense region.
Claim 8
Dependent Claim
28 words
A head as claimed in claim 6 characterised by the sensor having an edge (96), said exchange-biasing material (16,18) being spaced a short distance (36) from the edge.
Claim 9
Dependent Claim
21 words
A head as claimed in any of claims 5 to 7 characterised in that the contacts contact respective lateral, pointed ends.
Claim 10
Dependent Claim
21 words
A head as claimed in claim 8 characterised in that said contacts have parallel canted surfaces in said central sense region.
Claim 11
Dependent Claim
21 words
A head as claimed in claim 8 characterised in that said contacts have uncanted parallel surfaces in the central sense region.
Claim 12
Independent Claim
272 words
A method of making a head as claimed in any preceding claim characterised by comprising: depositing a first spacer layer (62) of oxide on a soft magnetic substrate (60); depositing on said spacer layer and patterning a magnetoresistive sensor material (64) to have two ends; depositing and patterning a layer (66) of metal contacts to the ends of said sensor material spaced by a read gap and defining in said sensor material a central sense region; depositing a second spacer layer (68) of oxide upon said sensor material metal contacts and first spacer layer; depositing a layer (70) of organic polymer upon said second spacer layer (68); patterning said layer (70) of organic polymer to remove it from an area adjacent said sensor material; depositing a trailing pole layer (72) of ferromagnetic material; depositing and patterning a write gap oxide material (75); depositing and patterning a second layer (74) of organic polymer; depositing and patterning a layer of metal coils (78) over said organic polymer; depositing and patterning a third layer (76) of organic polymer over said cells; depositing a leading pole layer (79) of ferromagnetic material upon said second and third layers (74,76) or organic polymer and said trailing pole layer (72) and patterning said leading pole layer (79) to remove the ferromagnetic material from all but a narrow width length at the region above said central sense region, the narrow width defining a written track width, whereby said trailing pole layer (72) spans the sensor material from end to end and the leading pole layer (79) has a narrow width defining a written track width above the central sense region.
Claim 13
Dependent Claim
38 words
A method as claimed in claim 11 characterised by including covering the layers in a non-magnetic material and lapping said first end to a position defining a predetermined gap height of said leading and trailing pole layers (72,79).
Claim 14
Dependent Claim
143 words
A magnetoresistive head having a read/write surface; a pair of inductive write poles (72,79) and a soft-magnetic shield (60) forming two gaps at said read/write surface, a first gap between the poles, a second gap between one (72) of the said poles and said shield (60), said write poles connected in a back gap region, the write pole forming a portion of the second gap comprising a trailing pole and the other write pole comprising a leading pole (70) and a magnetoresistive sensor (64) having a central sense region mounted in said second gap; characterised in that said leading one (70) of said poles has a length defining a track width, the central sense region of the magnetoresistive sensor is approximately the same length as the leading pole (79) and the trailing pole has a length at least as long as the sensor.
Claim 15
Dependent Claim
143 words
A magnetoresistive head having a read/write surface; a pair of inductive write poles (72,79) and a soft-magnetic shield (60) forming two gaps at said read/write surface, a first gap between the poles, a second gap between one (72) of the said poles and said shield (60), said write poles connected in a back gap region, the write pole forming a portion of the second gap comprising a trailing pole and the other write pole comprising a leading pole (70) and a magnetoresistive sensor (64) having a central sense region mounted in said second gap; characterised in that said leading one (70) of said poles has a length defining a track width, the central sense region of the magnetoresistive sensor is approximately the same length as the leading pole (79) and the trailing pole has a length at least as long as the sensor.
References Cited (Backward Citations)
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