Patent ID: 9343132
Filing Date: 2016-05-17
CPC Classification: G11C

Claim Text:
1. A write method to switch a free layer magnetization direction in a magnetic tunnel junction (MTJ) in a STT-MRAM device, comprising: (a) providing an array of memory elements and selectively accessing a MTJ with a write circuit; (b) applying a first current of sufficient magnitude to switch a free layer having perpendicular magnetic anisotropy (PMA) and with a precession frequency proximate to 20 GHz in the MTJ during a plurality of “n” write periods, the first current is applied between a bit line and a source line and flows through the MTJ in a first direction during each of the write periods; (c) applying a second current with a magnitude less than required to switch the free layer magnetization during “n−1” domain dissipation periods wherein a domain dissipation period follows each write period except for a final write period and has a duration of 20 to 100 free layer precessions, the second current is applied between the source line and the bit line and flows through the MTJ in a direction opposite to that of the first direction; and (d) terminating the write process by applying no current to the MTJ during a final period of time.