Patent ID: 8609439

Claim:
A method for manufacturing a magnetic tunnel junction to be written with a spin polarized current, the magnetic tunnel junction comprising a tunnel barrier layer between a first ferromagnetic layer having a first magnetization with a fixed orientation and a second ferromagnetic layer having a second magnetization being freely orientable, and a polarizing layer having a polarizing magnetization; comprising: depositing the first ferromagnetic layer, the tunnel barrier layer, and the second ferromagnetic layer; annealing the deposited ferromagnetic layers at a first annealing temperature such as a tunnel magnetoresistance of the magnetic tunnel junction is equal or greater than about 150%; depositing the polarizer layer; and annealing the deposited polarizer layer at a second annealing temperature such as to orient the polarizing magnetization substantially perpendicular to the first and second magnetization, said annealing the deposited ferromagnetic layers at the first annealing temperature being performed prior to depositing the polarizer layer.