Patent ID: 7359237

Claim:
A magnetic random access memory (MRAM) with high write selectivity and low power consumption comprising a plurality of magnetic memory units, each of the magnetic memory units comprises: a lower layer write word line extending along a first direction; a plurality of upper layer write word lines extending along a second direction substantially perpendicular to the first direction; a plurality of pillar write word lines connecting the upper layer write word lines to the lower layer write word line to provide write current channels for the magnetic memory unit; a magnetic memory cell having a magnetic tunnel junction, the magnetic memory cell made of materials comprising a magnetic material in the MRAM and whose memory state is determined by changing its magnetization orientation; and a plurality of sidewall keepers, each of which covers a corresponding pillar write word line except for the part facing the magnetic memory cell, wherein each of the sidewall keeper confines magnetic flux on the magnetic tunnel junction so that adjacent magnetic tunnel junction cells are not affected by the magnetic field produced by the pillar write word line.