Patent ID: 6728132
Filing Date: 2004-04-27
Classification: B82Y,G11C,H01F

Abstract:
A sense layer for a magnetic memory element, said sense layer comprising:a first magnetizable layer with a magnetic moment oriented in a first direction; a second magnetizable layer with a magnetic moment oriented in a second direction opposite to said first direction; a spacer layer formed between said first and second magnetizable layers; said layers being formed of a material and thickness sufficient to provide stray field coupling between said first and second layers across said spacer layer such that said first and second layers have magnetic moments oriented antiparallel to each other; and said layers being formed of a material and thickness sufficient to provide antiferromagnetic exchange coupling between the first and second layers across said spacer layer such that the magnetic moments of the first and second layers are free to rotate substantially simultaneously in the presence of an applied magnetic field so that the first and second magnetic moments of the magnetizable layers can be oriented in the other of said first and second directions.