Patent ID: 7772659
Filing Date: 2010-08-10
Classification: G11C

Abstract:
1. A magnetic device of reduced lateral dimensions comprising a least two layers made of magnetic material separated by at least one interlayer made of non-magnetic material, said layers made of magnetic material each have magnetization oriented substantially perpendicular to the plane of said layers; said layer made of non-magnetic material induces an antiferromagnetic coupling field between said layers made of magnetic material, the direction and amplitude of this field attenuating the effects of the ferromagnetic coupling field of magnetostatic origin that occurs between said layers made of magnetic material, wherein the resultant of said ferromagnetic and antiferromagnetic coupling fields is weaker than the weaker of the coercive fields of the layers made of magnetic material in order that the two relative magnetization orientations of the magnetic layers, parallel and antiparallel, are stable in the absence of any external magnetic field; and the material of said layer made of non-magnetic material is selected from the group consisting of ruthenium, chrome, gold, silver, vanadium and niobium, or an insulating alloy selected from the group consisting of magnesium oxide, zirconium oxide, titanium oxide, tantalum oxide, chrome oxide and ruthenium oxide, which induces the antiferromagnetic coupling field that produces magnetic independence between said layers made of magnetic material.