MAINTAINING A CERCITIVE FIELD AFTER HIGH TEMPERATURE TEMPERATURES FOR MAGNETIC DEVICE APPLICATIONS WITH VERTICAL MAGNETIC ANISOTROPY

摘要

A magnetic tunnel contact with perpendicular magnetic anisotropy (PMA MTJ) is disclosed, a free layer (14) having an interface (20) with a tunnel barrier layer (13) and a second interface (21) with an oxide layer (15). A lattice tuning layer (16-1) adjoins an opposite side of the oxide layer with respect to the free layer and consists of CoFeNiLM or CoFeNiL, where L is one of B, Zr, Nb, Hf, Mo, Cu, Cr, Mg, Ta, Ti , Au, Ag or P and M is one of Mo, Mg, Ta, Cr, W or V, (x + y + z + w + v) = 100 atom%, x + y o and each of v and w o is. The lattice tuning layer grows a BCC structure during annealing at about 400 ° C, thereby promoting BCC structure growth in the oxide layer. As a result, PMA of the free layer is strengthened and maintained to give improved thermal stability.