Patent ID: 8497538

Claim:
An MRAM bit comprising: a free magnetic region; an electrode; a fixed magnetic region consisting of a synthetic antiferromagnetic material grown on the electrode, with H flop greater than the switching field of the free magnetic region and with broken magnetic symmetry to define a preferred set direction of the magnetic moments of the synthetic antiferromagnet; and a tunneling barrier comprising a dielectric layer positioned between the free magnetic region and the fixed magnetic region, the fixed magnetic region comprising: a first ferromagnetic layer; a second ferromagnetic layer; a first anti-ferromagnetic coupling spacer layer grown between the first and second ferromagnetic layer; a third ferromagnetic layer grown between the first ferromagnetic layer and the first anti-ferromagnetic coupling spacer layer; and wherein the first ferromagnetic layer and the second ferromagnetic layer comprise an amorphous cobalt-iron-boron alloy, the third ferromagnetic layer comprises one of a crystalline cobalt-iron alloy and a crystalline cobalt-iron-boron alloy, and the first anti-ferromagnetic coupling spacer layer comprises at least one of the elements Ruthenium, Rhodium, Chromium, Vanadium, Molybdenum, combinations and alloys thereof.