The effect of B concentration on the tunneling magnetoresistance (TMR) of (Co 25Fe 75) 100-xB x/MgO/ (Co 25Fe 75) 100-xB x (x = 22 and 33) pseudo-spin-valve (P-SV) magnetic tunnel junctions (MTJs) was investigated. The TMR ratios for optimally annealed MTJs with x 22 and 33 were 340% and 170%, respectively, at room temperature. High resolution transmission electron microscopy (HRTEM) observation showed a weaker (001) texture in the MgO barrier in the MTJ with x = 33. The bottom electrode was not fully crystallized even with a considerable amount of B in the (Co 25Fe 75) 67B 33, while good epitaxy was observed between (001) textured MgO and (Co 25Fe 75) 78B 22 electrodes.
ASJC Scopus subject areas
- Physics and Astronomy(all)