Patent ID: 8519498

Claim:
A magnetic cell comprising: a ferromagnetic free layer having a free magnetization orientation direction; a first ferromagnetic pinned reference layer having a first reference magnetization orientation direction that is parallel or anti-parallel to the free magnetization orientation direction, and the first ferromagnetic pinned reference layer comprises a synthetic anti-ferromagnetic element having a first blocking temperature; a first oxide barrier layer between the ferromagnetic free layer and the first ferromagnetic pinned reference layer; and a second ferromagnetic pinned reference layer having a second reference magnetization orientation direction that is orthogonal to the first reference magnetization orientation direction, the ferromagnetic free layer between the first ferromagnetic pinned reference layer and the second ferromagnetic pinned reference layer, and the second ferromagnetic pinned reference layer comprises a synthetic anti-ferromagnetic element having a second blocking temperature; wherein the second blocking temperature is less than the first blocking temperature.