Patent ID: 6219273
Filing Date: 2001-04-17
Classification: G11C

Abstract:
A random access memory system comprising:a plurality of magnetic storage array cells, each cell having a hysteresis characteristic, such that data can be written to or read from said cell, without interference from other cells, said magnetic storage array cells also having a characteristic that enables retention of data when power is shut off; anda control circuit operative to read data from and write data to said plurality of magnetic storage array cells, said control circuit generating currents to apply electromagnetic fields to the plurality of magnetic storage array cells, includinga first current applied to a first line of said cell that lowers a switching threshold value of the cell, anda second current of a predetermined amount applied to a second line of said cell in a particular manner for reading or writing,wherein writing occurs when said first and second currents are applied to said first and second lines, and reading occurs when said first current is applied to the first line and a negative current followed by a positive current is applied to the second line.