Patent ID: 7298643
Filing Date: 2007-11-20
Classification: G11C

Abstract:
1. A magnetoresistive memory element comprising: a trapped magnetic region and a free magnetic region separated by a barrier layer, the free magnetic region including a stack of at least two antiferromagnetically-coupled ferromagnetic layers, a layer magnetic moment vector being associated with each ferromagnetic layer, a resulting magnetic moment vector, equal to a sum of the layer magnetic moment vectors, having an amplitude smaller than at least 40% of an amplitude of the layer magnetic moment vector of greatest amplitude, wherein at least one of an anisotropy field or demagnetizing field tensor is not identical for the at least two ferromagnetic layers within the stack, whereby a plurality of angular deviations of the layer magnetic moment vectors are different at the time of an application of an external magnetic field and wherein the magnetic moment vector of the ferromagnetic layer of the free magnetic region in contact with the barrier layer is oriented according to one of two opposite orientations of a selected direction, and is concurrently responsive to a first magnetic field alone the selected direction, and a second magnetic field according to a direction substantially perpendicular to the selected direction.