Patent ID: 9165625
Filing Date: 2015-10-20
Classification: G11C,H01L

Abstract:
1. A magnetic memory cell on a substrate, the memory cell comprising a ferromagnetic free layer, a first pinned reference layer and a second pinned reference layer, each having a magnetic anisotropy perpendicular to the substrate, the first and second pinned reference layer are unbalanced synthetic antiferromagnetic (SAF) coupled structures each unbalanced synthetic antiferromagnetic (SAF) coupled structure comprising two ferromagnetic layers separated by a metallic spacer and the two ferromagnetic layers have opposing magnetizations of unequal magnitude resulting in a net magnetization, the free layer between the first pinned reference layer and the second pinned reference layer and having a magnetization orientation perpendicular to the substrate and switchable by spin torque from a first orientation to an opposite second orientation, the magnetization of the free layer coupled to each of the first pinned reference layer and the second pinned reference layer and a first nonmagnetic and insulating barrier layer positioned between the free layer and the first pinned reference layer and a second nonmagnetic and insulating barrier layer positioned between the free layer and the second pinned reference layer.