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Wear Resistant Multilayer Magnetic Film

IP.com Disclosure Number: IPCOM000081338D
Original Publication Date: 1974-May-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Heller, JO: AUTHOR

Abstract

By means of this sputtering process, alternate layers of magnetic and nonmagnetizable substances are applied to a substrate consisting, amongst other materials, of safety glass. The magnetic layers are made up of seven 150 Angstrom cobalt films, whereas the nonmagnetizable layers are made up of seven 125 Angstrom silicon dioxide films. An eighth 2000 Angstrom silicon dioxide film forms the protective layer for the topmost film of the multilayer magnetic structure.

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Wear Resistant Multilayer Magnetic Film

By means of this sputtering process, alternate layers of magnetic and nonmagnetizable substances are applied to a substrate consisting, amongst other materials, of safety glass. The magnetic layers are made up of seven 150 Angstrom cobalt films, whereas the nonmagnetizable layers are made up of seven 125 Angstrom silicon dioxide films. An eighth 2000 Angstrom silicon dioxide film forms the protective layer for the topmost film of the multilayer magnetic structure.

For the application of the sputtering process, the substrate is alternately subjected to an RF discharge, using a silicon dioxide target, and to an RF or a DC discharge, using a cobalt target. The layer deposition temperature can be chosen so low that the substrate glasses used are not damaged or lose their specified magnetic characteristics.

While the topmost silicon dioxide film serves as a protective layer, the silicon dioxide intermediate layers contribute towards the magnetic decoupling of the metal layers and the mechanical stability of the magnetic film, by increasing the elasticity of the latter.

A wear-resistant magnetic film with similar characteristics can be obtained by using iron, cobalt alloys, magnetic oxides and corresponding steels for the respective magnetic layers. Similarly, the nonmagnetizable layers can consist of aluminum oxide or other wear-resistant oxides and ceramic materials, respectively.

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