Browse Prior Art Database

Magnetic Memory

IP.com Disclosure Number: IPCOM000097312D
Original Publication Date: 1962-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Middelhoek, S: AUTHOR

Abstract

The magnetic memory employs bipartite thin film storage cells represented by permalloy striplines with a uniaxial anisotropy. Memory operation is based on orthogonal field switching and current flow through the storage cells themselves. The memory is word organized and enables non destructive readout.

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Magnetic Memory

The magnetic memory employs bipartite thin film storage cells represented by permalloy striplines with a uniaxial anisotropy. Memory operation is based on orthogonal field switching and current flow through the storage cells themselves. The memory is word organized and enables non destructive readout.

The matrix array has a plurality of digit lines and word drive lines which are positioned perpendicular to each other. The digit lines are formed by a pair of permalloy striplines 11 and 12 having an easy direction &. These lines are parallel connected at their respective left and right hand terminals 13 and 14. The word drive lines are formed by a triplicate, sandwiched copper stripline arrangement 15, 16 and 17. The ends of these, opposite to the terminals 25, 26 and 27, are conductively connected for the purpose of providing an E-shaped current path. The drive conductors are situated above as well as beneath and in the middle of the permalloy conductors. The areas of the permalloy conductors between the driver striplines represent individual bipartite storage cells.

For writing, a drive pulse is applied via terminals 25 and 27to the two outside drive conductors 15 and 17 of a selected word line. This causes rotation of the magnetization of the associated storage cells into the hard direction. Simultaneously, the digit lines are supplied with current i of such polarity as is determined by the binary information to be stored. The parallel running cu...