Patent ID: 8546896

Claim:
A magnetic substructure for use in a magnetic device, the magnetic substructure comprising: a plurality of ferromagnetic layers; a plurality of nonmagnetic layers, the plurality of ferromagnetic layers being interleaved with the plurality of nonmagnetic layers, the plurality of ferromagnetic layers being immiscible with the plurality of nonmagnetic layers and chemically stable with respect to the plurality of nonmagnetic layers, the plurality of ferromagnetic layers also being substantially free of a magnetically dead layer-producing interaction with the plurality of nonmagnetic layers, the plurality of nonmagnetic layers inducing a perpendicular anisotropy in the plurality of ferromagnetic layers, the perpendicular anisotropy corresponding to a perpendicular anisotropy energy and wherein the magnetic substructure has an out-of-plane demagnetization energy, the perpendicular anisotropy energy being greater than the out-of-plane demagnetization energy; and wherein the magnetic substructure is configured to be switchable between a plurality of stable magnetic states when a write current is passed through the magnetic substructure.