Browse Prior Art Database

Magnetoresistive Head

IP.com Disclosure Number: IPCOM000084407D
Original Publication Date: 1975-Nov-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Bate, G: AUTHOR [+2]

Abstract

This structure provides a magnetoresistive read head capable of being easily and precisely fabricated. As schematically illustrated in this multitrack version the head structure consists of a nonmagnetic substrate block 2, preferably of wear resistant material such as ceramic, Al(2)O(3), silicon or sapphire.

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Magnetoresistive Head

This structure provides a magnetoresistive read head capable of being easily and precisely fabricated. As schematically illustrated in this multitrack version the head structure consists of a nonmagnetic substrate block 2, preferably of wear resistant material such as ceramic, Al(2)O(3), silicon or sapphire.

In this substrate 2 a first groove 4 has been cut, for example, by a stylus. Pairs of electrodes 6, 8, and 10 are introduced into the groove through block 2 near the terminus of what will be each track or transducer. Grooves 12, 13 and 14 orthogonal to groove 4 are produced in substrate 2. Then, using known deposition techniques, such as vacuum deposition or sputtering, and known photolithographic and etching methods, U-shaped films 16, 18 and 20 of magnetoresistive material are deposited in the portions of groove 4 corresponding to each individual read track.

The magnetoresistive material is metallic, for example, permalloy, and serves to conduct a sense current between each pair of electrodes. Magnetic bias source 22, in the form of a conductor or a magnetic material, for example, provides magnetic bias to each head in the series. Bias source 22 is insulated, per se, or is separated from the magnetoresistive material by deposited dielectric. Source 22 is shown in exploded view to its normal position within groove 4.

With slight modification this type of structure may also be utilized to provide a single track transducer. Where a single...