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Magnetic Thin Film Alloy Improved Thermal Stability

IP.com Disclosure Number: IPCOM000093870D
Original Publication Date: 1966-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Ahn, KY: AUTHOR [+3]

Abstract

This magnetic alloy is suitable for thin-film computer memories. The alloy is formed by co-evaporating gold and 83- 17 permalloy on to suitable substrates. The alloy formed by this procedure is a metastable solid solution of gold and permalloy.

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Magnetic Thin Film Alloy Improved Thermal Stability

This magnetic alloy is suitable for thin-film computer memories. The alloy is formed by co-evaporating gold and 83- 17 permalloy on to suitable substrates. The alloy formed by this procedure is a metastable solid solution of gold and permalloy.

Annealing these films for extended periods at 200 degrees C. does not change their magnetic properties enough to make them unsuitable for memory applications. Annealing permalloy in the same manner renders the permalloy films unsuitable for memory applications. The effects of annealing are shown in the table. Permalloy films after a four hour anneal at 200 degrees C. have a very large dispersion. The gold-permalloy improves slightly with annealing.

The following is a comparison of magnetic properties of permalloy and gold-permalloy after four one hour annealing periods in forming gas.

I. Permalloy H(c)(oe) H(k)(oe) alpha A. Before 2.24 3.54 2
B. After 1.28 1.28 9
II. Au-Permalloy 19.5%(wt) Au

A. Before 1.12 4.0 4
B. After 1.12 3.84 1.5.

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