Patent ID: 8102701

Claim:
A magnetic memory device of MRAM type with a thermally-assisted writing procedure, the magnetic memory device being formed from a plurality of memory cells, each memory cell comprising: a magnetic tunnel junction formed from a magnetic storage layer in which data can be written in a writing process; a reference layer, having a magnetization being always substantially in the same direction at any time of the writing process; an insulating layer between the reference layer and the storage layer; wherein the magnetic tunnel junction further comprises: a writing layer made of a ferrimagnetic 3d-4f amorphous alloy and comprising: a net magnetization containing a first magnetization contribution originating from the sub-lattice of 3d transition elements; and a second magnetization contribution originating from the sub-lattice of 4f rare-earth elements; wherein the net magnetization of the writing layer is dominated by the second magnetization contribution at a temperature below a compensation temperature T COMP of the writing layer, and dominated by the first magnetization contribution at a temperature above T COMP .