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Nondestructive Readout Memory Element

IP.com Disclosure Number: IPCOM000095312D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Sagnis, JC: AUTHOR [+2]

Abstract

The memory device comprises body 10 of magnetic material, e. g., 4-79 Mo-permalloy. Toroidal region T has an aperture H. Vb and R pass a DC bias current Ib through the body 10. Conductor 12 passes a current lh through the aperture H of region T. Conductor 14 passes a current Ir through the aperture H of region T. Es and C sense an output voltage developed across body 10.

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Nondestructive Readout Memory Element

The memory device comprises body 10 of magnetic material, e. g., 4-79 Mo-permalloy. Toroidal region T has an aperture H. Vb and R pass a DC bias current Ib through the body 10. Conductor 12 passes a current lh through the aperture H of region T. Conductor 14 passes a current Ir through the aperture H of region T. Es and C sense an output voltage developed across body 10.

Region T is magnetized in the 1 or 0 direction, as indicated, by a set current, for example, current Ih. Current 1b produces an internal magnetic field in body 10 which interacts with the magnetization of region T. This interaction alters the toroidal magnetization. There results a new magnetic condition. This is a function of the 1 or 0 direction of the toroidal magnetization and the polarity of the magnetic fields within region T produced by current Ib.

Nondestructive sensing of the magnetic state, 1 or 0, of region T is accomplished by passing through 14 a pulse of current Ir through aperture H of region T. The magnetic field produced by Ir interacts with the magnetization of region T and causes a transient flux change. When 1r is removed, region T returns substantially to its prepulsed condition.

The transient flux change develops a voltage across body 10. The polarity of this voltage is a function of the magnetic state 1 or 0 of region T, the direction of Ib through body 10 and the direction of 1r through aperture H. Nondestructive readout signals are in...