Browse Prior Art Database

MR Read Head Design

IP.com Disclosure Number: IPCOM000040179D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Christensen, ER: AUTHOR [+3]

Abstract

A compensating design pattern and biasing technique is shown to achieve common-mode noise rejection in a magnetoresistive (MR) head element. A pseudo MR device is included between the contact pads to the MR head. The pseudo MR device is connected as one leg of a bridge network with two external matched resistors and the MR head element. The bridge network is connected across a power supply with the output of the MR stripes connected to an operational amplifier. The figure shows a standard single-ended MR read element 10 with its one sense leg 11 and a common leg 12. A tapped MR compensating device 13 is stagger recessed from the lapped stripe height shown at line 14. The MR compensating device 13 can occupy almost the entire area to the MR read element of the next track.

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MR Read Head Design

A compensating design pattern and biasing technique is shown to achieve common-mode noise rejection in a magnetoresistive (MR) head element. A pseudo MR device is included between the contact pads to the MR head. The pseudo MR device is connected as one leg of a bridge network with two external matched resistors and the MR head element. The bridge network is connected across a power supply with the output of the MR stripes connected to an operational amplifier. The figure shows a standard single-ended MR read element 10 with its one sense leg 11 and a common leg 12. A tapped MR compensating device 13 is stagger recessed from the lapped stripe height shown at line 14. The MR compensating device 13 can occupy almost the entire area to the MR read element of the next track. The MR compensating device 13 is composed of chevron-shaped stripes 15 of MR material. The device 13 is connected between the common leg 12 and a second sense leg 16. The device 13 can be used as a lapping guide to help determine the lapped stripe height line 14 as well as changing resistance with the MR read element 10 as the head element wears. The development of a signal from the compensating device 13 is avoided by the anti-parallel direction of the current flow through the device 13. The signal from the chevron shape is very small. The MR compensating device 13 is set to be as thin as possible. The serpentine chevron pattern helps produce a resistance match to the MR read...