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Non-destructive Readout Memory

IP.com Disclosure Number: IPCOM000097352D
Original Publication Date: 1962-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Dietrich, W: AUTHOR [+2]

Abstract

The non-destructive readout memory has thin magnetic film storage cells with uniaxial anisotropy. They are arranged in a word-organized manner and operated according to the orthogonal field driving method. Individual storage cells 11 are deposited on a well conducting metal substrate 12, insulated from it by an intermediate siliciumoxide layer. Next to cells 11 is sensing stripline 13 followed by word stripline 14. The axis of the latter is well-aligned with the easy direction of the thin film.

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Non-destructive Readout Memory

The non-destructive readout memory has thin magnetic film storage cells with uniaxial anisotropy.

They are arranged in a word-organized manner and operated according to the orthogonal field driving method. Individual storage cells 11 are deposited on a well conducting metal substrate 12, insulated from it by an intermediate siliciumoxide layer. Next to cells 11 is sensing stripline 13 followed by word stripline 14. The axis of the latter is well-aligned with the easy direction of the thin film.

For information readout, the magnetization of a thin film cell is completely switched from the easy direction into the hard direction by applying a short-pulse driving field. Its amplitude exceeds the anisotropy field strength. After termination of the driving pulse, the magnetization rotates coherently back into its original orientation. This action is due to the eddy currents which are generated in the conductors nearby the thin film cell. The timing of the driving pulse is such that the eddy currents are still effective after the driving pulse decays.

The left-hand drawing shows the static magnetic field of a thin magnetic film cell, when the magnetization M is in its rest position (easy direction). When the magnetization of the thin film cell is rapidly and coherently rotated into the hard direction, the eddy currents occurring in the metal conductors tend to sustain the previous magnetic field. Consequently, after termination of the driv...