Patent ID: 7994596
Filing Date: 2011-08-09
Classification: B82Y,G11C,H01F,H01L

Abstract:
1. An MTJ memory cell having a substantially circular horizontal cross-section, wherein a ferromagnetic free layer in said cell has a magnetic anisotropy provided by magnetic coupling with an antiferromagnetic layer comprising: a substrate; a layered magnetic tunneling junction (MTJ) structure, formed on said substrate, said MTJ structure comprising: wherein said thin top antiferromagnetic layer of thickness less than 20 angstroms is magnetically coupled to said ferromagnetic free layer by interfacial exchange coupling across an interface between said thin top antiferromagnetic layer and said ferromagnetic free layer to produce, thereby, a simultaneously optimized coercivity and magnetic anisotropy in said ferromagnetic free layer and wherein said magnetic anisotropy has zero unidirectionality; and wherein said bottom antiferromagnetic layer is exchange coupled to said SyAF pinned layer.