Patent ID: 8866207

Claim:
A method of forming a magnetic tunnel junction (MTJ) for a magnetic random access memory (MRAM), the method comprising: forming a magnetic free layer having a variable magnetization direction; forming a tunnel barrier over the free layer, the tunnel barrier comprising an insulating material; forming a magnetic fixed layer having an invariable magnetization direction over the tunnel barrier, wherein the free layer and the fixed layer have perpendicular magnetic anisotropy; and forming: a composite fixed layer having an invariable magnetization direction, the composite fixed layer disposed adjacent the tunnel barrier such that the tunnel barrier is located between the free layer and the fixed layer, wherein the free layer and the composite fixed layer have perpendicular magnetic anisotropy, the composite fixed layer comprising a dusting layer, a spacer layer, and a reference layer, wherein the spacer layer is located between the reference layer and the tunnel barrier, and wherein the dusting layer is located between the spacer layer and the tunnel barrier, wherein the dusting layer and the reference layer are magnetically coupled through the spacer layer and have perpendicular magnetic anisotropy; a synthetic antiferromagnetic (SAF) fixed layer structure, the SAF fixed layer structure comprising a SAF spacer located between the composite fixed layer and a second fixed magnetic layer, wherein the composite fixed layer and the second fixed magnetic layer are anti-parallelly coupled through the SAF spacer; and a dipole layer, wherein the free layer is located between the dipole layer and the tunnel barrier.