The integrated magnetic memory: Toward 500 000 bit/in2

Very low processing costs may be obtained using the integrated magnetic memory technique. Then the price of the complete memory system is approximately the price of the electronics. Higher bit densities are very desirable in order to decrease the cost by decreasing the driving currents and in order to increase the speed by shortening the length of the digit and sense lines. This paper shows how it is possible to increase the density from 3500 bit/in²(first generation) to 20 000 bit/in²(second generation) and 500 000 bit/in²(third generation), thereby obtaining very new and interesting properties. For additional details, see Digests of the 1972 Intermag Conference (available from IEEE Headquarters).