Patent ID: 6906950

Claim:
A memory device comprising a plurality of magneto-resistive memory cells, the memory device comprising: a free magnetic layer in each of the plurality of memory cells, comprising: a first widened end-portion at a first end of the free magnetic layer; and a second widened end-portion at a second end of the free magnetic layer opposite to the first end of the free magnetic layer; and a pinned magnetic layer in each of the plurality of memory cells, comprising: a third widened end-portion at a first end of the pinned magnetic layer; and a fourth widened end-portion at a second end of the pinned magnetic layer opposite to the first end of the pinned magnetic layer, wherein a first minimum magnitude of an applied magnetic field for switching the magneto-resistive memory cell from a low resistance state to a high resistance state is about 80-120 percent of a second minimum magnitude of an applied magnetic field for switching the magneto-resistive memory cell from the high resistance state to the low resistance state.