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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.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
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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
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...