Patent ID: 6633498
Filing Date: 2003-10-14
Classification: G11C

Abstract:
A magnetoresistive tunneling junction memory cell with a switching field, the cell comprising:a first magnetic region having a resultant magnetic moment vector fixed in a preferred direction in the absence of an applied magnetic field; an electrically insulating material positioned on the first magnetic region to form a magnetoresistive tunneling junction; a second magnetic region positioned on the electrically insulating material, the second magnetic region having an anisotropy easy axis and a resultant magnetic moment vector oriented in a position parallel or anti-parallel to that of the first magnetic region; wherein the magnetoresistive tunneling junction memory cell operates in a toggle writing mode; wherein a bias field along the anisotropy easy axis and within the second magnetic region may be created by an applied magnetic field to alter the switching field; and wherein at least one of the first and second magnetic regions include a synthetic anti-ferromagnetic layer material that has an adjustable magnetic switching volume wherein the synthetic anti-ferromagnetic layer material includes N ferromagnetic layers which are anti-ferromagnetically coupled, where N is a whole number greater than or equal to two.