Browse Prior Art Database

Magnetic Head Assembly with Magnetoresistive Sensor

IP.com Disclosure Number: IPCOM000051835D
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 20K

Publishing Venue

IBM

Related People

Schwartz, TA: AUTHOR

Abstract

A magnetic head having a magnetoresistive sensor 1 includes a magnetic shield 2 that also serves as a current-carrying bias conductor. The shield 2 is formed from a conductive magnetic material, such as permalloy. The height and thickness of the conductive shield are each at least two times that of the magnetoresistive sensor, so as to provide effective shielding of the magnetoresistive element and to maintain its high resolution characteristics. The length of the conductive shield is at least as long as the width of the active portion of the sensor to provide proper shielding and to enable a current that is parallel to the sensor for biasing.

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Magnetic Head Assembly with Magnetoresistive Sensor

A magnetic head having a magnetoresistive sensor 1 includes a magnetic shield 2 that also serves as a current-carrying bias conductor. The shield 2 is formed from a conductive magnetic material, such as permalloy. The height and thickness of the conductive shield are each at least two times that of the magnetoresistive sensor, so as to provide effective shielding of the magnetoresistive element and to maintain its high resolution characteristics. The length of the conductive shield is at least as long as the width of the active portion of the sensor to provide proper shielding and to enable a current that is parallel to the sensor for biasing.

With suitable film thickness, the conductive shield may be connected directly to one end of the magnetoresistive element. Also, nonconductive, nonmagnetic insulating layers may be disposed between the shields, sensors and conductor. By adding a conductor layer of low resistivity, such as gold, to the outer surface of the shield, noise reduction would be enhanced.

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