Patent ID: 8796045

Claim:
A method of forming a magnetic random access memory (MRAM) device, comprising: forming at least one write line; forming a first insulating layer over the at least one write line; forming a heating line on the first insulating layer; forming at least one tunnel junction above the at least one write line, the at least one tunnel junction connected to the heating line; forming a second insulating layer on the heating line; forming heat heating supply vias at each end of the current line; forming heat current supply lines connected to each heat current supply via; and forming at least one read line above the at least one tunnel junction and physically connected to the at least one tunnel junction, wherein the at least read line, at least one tunnel junction and at least one write line include a plurality of read lines, tunnel junctions and write lines, respectively, the method further comprising: forming the heating line to have a larger width between two adjacent tunnel junctions than adjacent to each tunnel junction.