Patent ID: 9171601
Filing Date: 2015-10-27
Classification: G11C,H01L

Abstract:
1. A magnetic memory cell comprising: a magnetoresistive element comprising a free ferromagnetic layer comprising a reversible magnetization direction directed substantially perpendicular to a film plane, a pinned ferromagnetic layer comprising a fixed magnetization direction directed perpendicular to the film plane, a tunnel barrier layer disposed between the free and pinned layers, and an assist ferromagnetic layer disposed adjacent to the free layer at its side distant from the tunnel barrier layer; means for providing a bias magnetic field along a magnetic hard axis of the free layer; and means for providing a spin-polarized current through the magnetoresistive element in a direction perpendicular to the film plane; wherein the pinned layer comprising a synthetic antiferromagnetic structure further comprising: a reference layer comprising a first coercivity and the fixed magnetization direction directed perpendicular to the film plane; a spin-polarizing layer disposed between the reference layer and the tunnel barrier layer and comprising a second coercivity which is substantially lower than the first coercivity; and a second nonmagnetic spacer layer, disposed between the reference layer and the spin-polarizing layer and providing a substantial antiferromagnetic exchange coupling between the reference layer and the spin-polarizing layer.