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MR Lead Arrangement for Improved Magnetic Stability

IP.com Disclosure Number: IPCOM000037710D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Heim, DE: AUTHOR

Abstract

A magnetoresistive (MR) sensor is shown in which the leads are separated with one lead on one side of the MR sensor film and the other lead is on the other side of th MR sensor film.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 95% of the total text.

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MR Lead Arrangement for Improved Magnetic Stability

A magnetoresistive (MR) sensor is shown in which the leads are separated with one lead on one side of the MR sensor film and the other lead is on the other side of th MR sensor film.

Conventional MR sensors have a lead arrangement in which both leads 2, 3 make contact on the same side of the MR sensor 1 as shown in Fig. 1. When sense current Is flows in one lead and out the other as shown in the drawing, longitudinal magnetic fields are generated within the MR sensor film near each lead. By the right-hand-rule, these fields are in opposite directions as shown by arrows 4, 5. With the MR sensor in a single domain state, the longitudinal field from one or the other of the leads must oppose the direction of the magnetization in the sensor which is undesirable from the standpoint of sensor stability.

The lead configuration shown on Fig. 2 has a first lead 6 on one side of the MR sensor 1 and a second lead 7 on the other side of MR sensor 1. With this lead arrangement the longitudinal magnetic fields from both leads 6, 7 are in the same direction, as shown by arrows 8, 9. This direction can be chosen to be that of the magnetic state of the MR sensor 1 (initialized direction). This lead arrangement therefore leads to increased device magnetic stability for single domain operation.

The lead arrangement is applicable to any two lead MR device in which the leads sensing the magneto-resistive effect in the MR sensor also...