Patent ID: 7796428

Claim:
A thermally assisted magnetic write memory, consisting of memory points or memory cells, each of which consists of a double magnetic tunnel junction separated from one another by a layer made from an antiferromagnetic material, and whereof the stacking order of the layers constituting them is reversed with regard to one another, each of the magnetic tunnel junctions comprising: a magnetic reference layer called “pinned layer” whereof the magnetization has a fixed direction; a magnetic storage layer, called “free layer” whereof the magnetization direction is variable, and consists of at least one layer made from a ferromagnetic material having an in-plane magnetization of the layer, magnetically coupled by exchange with a pinning layer made from an antiferromagnetic material and consisting of the layer separating the two magnetic tunnel junctions; an insulating layer inserted between the reference layer and the storage layer, constituting the tunnel barrier of the magnetic tunnel junction concerned; wherein the blocking temperature of the layer made from antiferromagnetic material separating the storage layers is lower than the blocking temperature of the reference layer of the corresponding magnetic tunnel junction; wherein the product RA resistance×area of the two tunnel barriers is different; wherein each memory point comprises means for heating the storage layers to a temperature above the blocking temperature of said layers; wherein the memory comprises means for applying a magnetic field for orienting the magnetization of the storage layer or layers of each memory point with regard to the magnetization of the reference layer or layers without changing the orientation of the reference layers concerned; and wherein that the storage layers are coupled magnetostatically across the layer made from antiferromagnetic material separating said storage layers, so that the magnetizations of said layers are placed in an antiparallel configuration when the temperature in the magnetic tunnel junction concerned exceeds the blocking temperature of said layer of antiferromagnetic material and in the absence of a magnetic field applied to said memory, or under the influence of a magnetic field of lower intensity than the magnetostatic coupling between said storage layers.