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High Field, Smooth Surface, Magnetic Layer

IP.com Disclosure Number: IPCOM000083637D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Roland, P: AUTHOR

Abstract

A procedure is provided for ensuring that the second permalloy film of a composite magnetoresistive sensor has a smooth surface.

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High Field, Smooth Surface, Magnetic Layer

A procedure is provided for ensuring that the second permalloy film of a composite magnetoresistive sensor has a smooth surface.

Heretofore, during fabrication of a magnetoresistive sensor, a permalloy film on a substrate has been heat treated above approx. = to 150 degrees C to increase its coercivity H(c). Thereafter, an insulator layer is deposited on the permalloy film which is followed by deposition of another permalloy film approx. = to 200 Angstrom thickness. Although the first permalloy film has originally a smooth surface, the surface becomes rough after the heat treatment resulting in an undesirable rough surface on the second permalloy film.

The present procedure obtains a smooth surface on the second permalloy film of the magnetoresistive sensor by forming the first permalloy film and the insulator layer, and then heat treating the composite to establish the desired coercivity in the permalloy film. After the second permalloy

The present procedure obtains a smooth surface on the second permalloy film of the magnetoresistive sensor by forming the first permalloy film and the insulator layer, and then heat treating the composite to establish the desired coercivity in the permalloy film. After the second permalloy film is now deposited on the insulator layer, it has a desired smooth surface.

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