Improvement of write error rate in voltage-driven magnetization switching

We investigate magnetization switching driven by the voltage-controlled magnetic anisotropy (VCMA) effect in two series of magnetic tunnel junctions with a Ta/CoFell/MgO structure. We demonstrate that improved thermal stability as well as the VCMA effect make it possible to achieve write error rates lower than 10(-6). We also show that the thermal stability of the free layer plays an important role in suppressing increased write errors due to precession-orbit transition induced by thermal fluctuation.