Patent ID: 8758850

Claim:
A method of manufacturing a spin transfer torque magnetic random access memory (STTMRAM) magnetic tunnel junction film stack comprising: a) first depositing a magnetic interface layer on top of a barrier layer to form a magnetic tunnel junction (MTJ), the magnetic interface layer being made partially of boron (B) b) after the first depositing step, annealing the STTMRAM MTJ film stack at a first temperature after depositing the magnetic interface layer, the annealing being in-situ within a deposition system without breaking the vacuum thereby avoiding oxidization and contamination of the surface of the magnetic interface layer; c) after the annealing step, cooling down the STTMRAM MTJ film stack to a second temperature that is lower than the first temperature; and d) after the cooling down step, second depositing a top layer on top of the magnetic interface layer, wherein the top layer is made of a single layer or has a multi-layer structure necessary to make the MTJ stack function in the STTMRAM MTJ film stack, wherein the top layer comprises at least one magnetic sub-layer.