Patent ID: 8168449

Claim:
A method for fabricating a magnetoresistive random access memory (MRAM), the method comprising: forming a mask over a magnetic layer, wherein the mask comprises at least one of tantalum, tantalum nitride, ruthenium tungsten, titanium, titanium nitride, copper, copper nitride, silicon, vanadium, vanadium nitride, niobium, niobium nitride, platinum manganese, molybdenum, carbon, and aluminum; forming a template on the mask; applying a diblock copolymer to the template; curing the diblock copolymer to form a first plurality of uniform shapes registered to the template; etching the mask to form a second plurality of uniform shapes; and etching the magnetic layer to form a third plurality of uniform shapes, the third plurality of uniform shapes comprising a plurality of magnetic tunnel junctions (MTJs).