Browse Prior Art Database

Negative Temperature Coefficient Material for MR Element Thermal Noise

IP.com Disclosure Number: IPCOM000083784D
Original Publication Date: 1975-Jul-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Bajorek, CH: AUTHOR [+3]

Abstract

A conventional magnetoresistive (MR) head element can have a negative temperature coefficient (NTC) material placed in proximity or in contact, to compensate for the thermal noise generated by the MR element. The thermal noise can be caused by frictional heating of the MR element when in contact with a magnetic medium, during the sensing of magnetic fields recorded on the medium. The objective is to minimize the thermally induced resistance change of the structure.

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Negative Temperature Coefficient Material for MR Element Thermal Noise

A conventional magnetoresistive (MR) head element can have a negative temperature coefficient (NTC) material placed in proximity or in contact, to compensate for the thermal noise generated by the MR element. The thermal noise can be caused by frictional heating of the MR element when in contact with a magnetic medium, during the sensing of magnetic fields recorded on the medium. The objective is to minimize the thermally induced resistance change of the structure.

The material can be electrically shunted to the MR element. The parallel shunt configuration permits close proximity of the sensing and compensating elements. The material chosen must possess a sizeable negative temperature coefficient of resistivity. A suitable material is indium-antimonide. The resistivity of the material must be compatible with the resistivity required by the MR element. The negative temperature coefficient material can be used to provide the bias field for the MR element.

The material can also be placed into a series configuration as shown in the figure. A plurality of MR elements are interconnected with a plurality of components made from the negative temperature coefficient NTC material. The leads for the drive current and sensing can be of any highly conductive material.

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