Patent ID: 8592927

Claim:
A magnetic element comprising a stack of layers including a composite free layer with at least two interfaces that produce interfacial perpendicular anisotropy, comprising: (a) a tunnel barrier layer; (b) the composite free layer having a FM1/moment diluting layer/FM2 configuration wherein both of the first ferromagnetic (FM1) layer and second ferromagnetic (FM2) layer are an Fe rich alloy with a Fe content >50 atomic % or a Co rich alloy with a Co content >50 atomic %, the FM1 layer has a first interface with the tunnel barrier layer, and the FM2 layer has a second interface with a perpendicular Hk enhancing layer, the first and second interfaces produce interfacial perpendicular anisotropy in the adjoining FM1 and FM2 layers, respectively, such that the interfacial perpendicular anisotropy dominates a shape anisotropy field and thereby establishes perpendicular magnetic anisotropy within the FM1 and FM2 layers; and (c) the perpendicular Hk enhancing layer.