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Browse Prior Art Database

Magnetic Film Process

IP.com Disclosure Number: IPCOM000096022D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Ahn, KY: AUTHOR

Abstract

In this process, magnetic films having a very low wall-motion coercive force are fabricated.

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Magnetic Film Process

In this process, magnetic films having a very low wall-motion coercive force are fabricated.

Pure permalloy, 99. 999% iron and 99. 99% nickel alloyed to 83% nickel - 17% iron weight composition, is prepared by arc melting in an argon atmosphere. This prepared permalloy is then vacuum evaporated, in a given magnetic field, on a suitable substrate, such as, glass, heated to a temperature between 150 degrees to 300 degrees centigrade.

The value of wall coercive force at 1 micron of film thickness is at least one order of magnitude smaller than that found in other magnetic films or in bulk magnetic material. The uniaxial anisotropy field of the films prepared by this process is of the order of 4 to 5 oersteds. The typical thickness dependence of the wall coercive force is shown.

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