An MTJ MRAM cell element, whose free layer has a shape induced magnetic
anisotropy, is formed between orthogonal word and bit lines. The bit line
is a composite line which includes a high conductivity current carrying
layer and a soft adjacent magnetic layer (SAL). During operation, the
soft magnetic layer concentrates the magnetic field of the current and,
due to its proximity to the free layer, it magnetically couples with the
free layer to produce two magnetization states of greater and lesser
stability. During switching, the layer is first placed in the less stable
state by a word line current, so that a small bit line current can switch
its magnetization direction. After switching, the state reverts to its
more stable form as a result of magnetostatic interaction with the SAL,
which prevents it from being accidentally rewritten when it is not
actually selected and also provides stability against thermal agitation.