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Magnetoresistive Magnetic Recording Sensor

IP.com Disclosure Number: IPCOM000036279D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 86K

Publishing Venue

IBM

Related People

Nix, JL: AUTHOR [+3]

Abstract

A thin film, magnetoresistive sensor for magnetic recording is described. Unlike conventional devices, the magnetic thin film is deposited onto the walls of a "V"-etched substrate rather than on a flat substrate. Then lapping the substrate from the "bottom", an air bearing surface may be formed without the need to bond a supporting piece. Also to be gained is minimization of wear to the magnetoresistive film during abrasion with recording media since the amount of the film exposed is reduced.

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Magnetoresistive Magnetic Recording Sensor

A thin film, magnetoresistive sensor for magnetic recording is described. Unlike conventional devices, the magnetic thin film is deposited onto the walls of a "V"-etched substrate rather than on a flat substrate. Then lapping the substrate from the "bottom", an air bearing surface may be formed without the need to bond a supporting piece. Also to be gained is minimization of wear to the magnetoresistive film during abrasion with recording media since the amount of the film exposed is reduced.

The sensor described above consists of a suitable substrate ma

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terial such as single crystal sapphire or manganese zinc ferrite which has desired wear characteristics. Into the substrate is etched, using standard techniques, a "V"-shaped hole (Fig. 1). First, a layer of dielectric insulator material is deposited over the substrate and walls of the "V" hole. Next, the magnetoresistive (MR) thin film is deposited and patterned. Finally, contact metal is deposited and patterned on the top side of the structure (Fig. 2). The device is lapped and contoured from the bottom side of the structure. When the substrate is of a magnetic material such as MnZn ferrite, the walls of the "V" of the substrate act as magnetic shields for the magnetoresistive film, with the short dimension of the "V" acting as the magnetic gap.

The device described herein differs from the prior art in that the magnetoresistive sensor is formed on the s...