Accession Number : AD0612832

Title :   A PROPOSAL FOR AN ASSOCIATIVE MEMORY USING MAGNETIC FILMS,

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : Raffel,J. I. ; Crowther,T. S.

Report Date : 07 MAR 1964

Pagination or Media Count : 1

Abstract : The proposed memory consists of a normal word line over a strip of magnetic film and a digit line split into three parallel conductors. Writing is accomplished using the standard method of coincidence of transverse and digit fields (all three digit conductors are excited equally). The result is a region at the intersection which is magnetized either to the right for a ONE or to the left for a ZERO. To interrogate the memory in all bits simultaneously, the middle digit conductors alone are excited with a field to the left, if searching for a ZERO, and with a field to the right, if searching for a ONE. For either match condition, there will be essentially no change in the magnetization of the interrogated cell. For a mismatch, the magnetization will rotate noncoherently to the multidomain pattern which occurs just below nucleation. It is proposed that the magnetoresistive effect be used to sense the mismatch condition. Experimentally, it is found that a resistance change corresponding to approximately 10 per cent of that for full transverse switching is obtained.

Descriptors :   (*MEMORY DEVICES, FILMS), (*FILMS, MAGNETIC RECORDING SYSTEMS), (*MAGNETIC RECORDING SYSTEMS, FILMS), MAGNETIC MATERIALS, INFORMATION RETRIEVAL

Distribution Statement : APPROVED FOR PUBLIC RELEASE