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Thin Film Magnetic Storage Element

IP.com Disclosure Number: IPCOM000095619D
Original Publication Date: 1964-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Louis, HP: AUTHOR

Abstract

The storage element comprises coupled magnetic films having a pronounced magnetic easy axis and having a low dispersion of that easy axis throughout the device.

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Thin Film Magnetic Storage Element

The storage element comprises coupled magnetic films having a pronounced magnetic easy axis and having a low dispersion of that easy axis throughout the device.

The element includes metallic ground plane 1 over which is superimposed magnetic film 2 with a magnetic easy axis parallel to the horizontal axis of the device. Word lines 3 are positioned over film 2 such that the longitudinal axis of the lines is parallel to the magnetic easy axis. Magnetic film 4 is superimposed over lines 3 with the magnetic easy axis of film 4 parallel to the easy axis of film
2. Common bit-sense lines are arranged over film 4 with their longitudinal axis perpendicular to the easy axis of the coupled magnetic films.

With this arrangement, the word current is always large enough to switch film 2 completely into the hard direction but has negligible effect, depending on the width of the word line and spacing from the ground plane, on film 4. In addition, the coupling of film 4 on film 2 is sufficiently large to partially rotate film 2 by an angle less than 90 degrees and is large enough to reset film 2, following the application of the word pulse, into the original state but small enough to avoid self-demagnetization of film 4. In this fashion the coupling field between the films in the hard direction acts to cancel the self-demagnetizing fields, thus reducing the dispersion of film 4 and the total dispersion of the device.

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