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Removal of Gallium from Amorphous Film Substrates

IP.com Disclosure Number: IPCOM000084923D
Original Publication Date: 1976-Jan-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Chicotka, RJ: AUTHOR [+2]

Abstract

Amorphous magnetic films are often used as bubble domain media in magnetic bubble domain devices. These films are examined and studied by optically viewing them through the substrate surface. When gallium is used as a heat sink layer on the substrate surface, it has to be removed in order to optically view the amorphous film. Previously, various solutions were used for this but there was danger that the substrate or film surface would be damaged.

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Removal of Gallium from Amorphous Film Substrates

Amorphous magnetic films are often used as bubble domain media in magnetic bubble domain devices. These films are examined and studied by optically viewing them through the substrate surface. When gallium is used as a heat sink layer on the substrate surface, it has to be removed in order to optically view the amorphous film. Previously, various solutions were used for this but there was danger that the substrate or film surface would be damaged.

To overcome these problems, all traces of gallium residue as well as bulk gallium are removed by applying a drop of concentrated NaOH to the surface having the gallium thereon, followed by rubbing for a few seconds with a Q-tips*. This causes the gallium to ball up and fall off. After this, the surface is rinsed with water and alcohol. This prevents damage to the film surface or the substrate should any NaOH fall onto it. * Trademark of Chesebrough-Ponds, Inc.

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