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Adjusting the Magnetostriction of NiFe Films by Controlled Oxidation

IP.com Disclosure Number: IPCOM000103172D
Original Publication Date: 1990-Jul-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 40K

Publishing Venue

IBM

Related People

Hwang, C: AUTHOR [+3]

Abstract

The control of magnetostriction is a very important parameter to control for the satisfactory performance of magnetoresistive heads. The magnetostriction of an NiFe film is a function of the composition and texture of the permalloy film. Thus, small changes in deposition parameters and/or processing conditions of the magnetoresistive head can change the magnetostriction of the permalloy film.

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Adjusting the Magnetostriction of NiFe Films by Controlled Oxidation

      The control of magnetostriction is a very important parameter
to control for the satisfactory performance of magnetoresistive
heads.  The magnetostriction of an NiFe film is a function of the
composition and texture of the permalloy film.  Thus, small changes
in deposition parameters and/or processing conditions of the
magnetoresistive head can change the magnetostriction of the
permalloy film.

      It has been found that thermal oxidation of the film of NiFe
will make the film more negatively magnetostrictive due to the
preferred oxidation of the Fe in the film.  The amount of change can
be controlled and reproduced by controlling the temperature and time
of the film oxidation. Changes as small as -0.1 to 0.2 v 10E-6 to as
large as -17 v 10E-6 have been reproducibly produced.  The
temperatures of the oxidation in air have varied from 110@C to 240@C
for times up to one hour.

      This process can be used to achieve the desired value of
magnetostriction after it has been determined what the effect of the
process has been on this value.  The composition of the target would
be chosen to ensure a more positive magnetostriction value prior to
the final oxidation chosen to lower the magnetostriction to the
desired value by the proper choice of time and temperature.  This
would allow the complete process to respond to subtle variations
effecting the magnetostriction of the final produc...