Browse Prior Art Database

Coupled Film Two Level NDRO Device

IP.com Disclosure Number: IPCOM000092473D
Original Publication Date: 1966-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Daughton, JM: AUTHOR [+2]

Abstract

This is a device in which data is stored in thin magnetic film elements 2. The latter are provided with conventional bit drivers. word drivers, sense amplifiers, and with word conductors 3 and bit conductors 4. Elements 2 have an easy axis of magnetization that is orthogonal to conductors 4 and this axis is used for storage. Elements 2 have a hard axis of magnetization that is orthogonal to conductors 3.

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Coupled Film Two Level NDRO Device

This is a device in which data is stored in thin magnetic film elements 2. The latter are provided with conventional bit drivers. word drivers, sense amplifiers, and with word conductors 3 and bit conductors 4. Elements 2 have an easy axis of magnetization that is orthogonal to conductors 4 and this axis is used for storage.

Elements 2 have a hard axis of magnetization that is orthogonal to conductors 3.

For a destructive read operation, a selected word driver is turned on to saturate associated elements 2 in a hard axis direction.

The voltage associated with this magnetization change is detected by the sense amplifier. For a write operation, the bit drivers are turned on to a polarity that corresponds to the data that is to be stored. The word drivers are then turned off and the magnetization of each element 2 goes to the easy direction that is established by the associated bit driver. The bit drivers are then turned off.

A nondestructive read operation is achieved by keeping the word current appropriately below the value to saturate the films. In such an operation, the anisotropy of the film provides the energy for restoring the film to its initial magnetization when the word current is removed. The write operation is similar to the destructive read-write operation already described.

Conventional nondestructive read memories use word drivers that provide two levels of current. One level is for destructive read and write. A low...