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Creep Free Thin Film Element

IP.com Disclosure Number: IPCOM000093969D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Middlehoek, S: AUTHOR

Abstract

This thin magnetic film element with two anisotropic films has creep free operation. The element does not require the evaporation of two films having essentially equal parameters.

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This is the abbreviated version, containing approximately 100% of the total text.

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Creep Free Thin Film Element

This thin magnetic film element with two anisotropic films has creep free operation. The element does not require the evaporation of two films having essentially equal parameters.

A storage film and a keeper film are arranged on top of each other and are separated by a thin SiO layer. The easy axes of the films are perpendicular to each other. That of the storage film is perpendicular to the read word field. This causes the magnetization to rotate towards its hard axis thus inducing an output signal in a sense line arranged adjacent to the storage element. The easy axis of the keeper film is parallel to the word field. This film does not essentially contribute to the output signal. It acts as a keeper for the domain walls of the storage film thus preventing the occurrence of Blochlines which might cause wall creeping in the storage film.

Only the parameters of the storage film must be controlled. The parameters of the keeper film are not critical, provided its coercive force is rather low and its thickness is larger than half of that of the storage film.

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