Magnetic tunnel junctions with improved TMR response and thermal stability

Results concerning the influence of the composition and design of different MTJ structures on their TMR response and thermal stability are presented. The TMR response for Ta/Ni 80 Fe 20 /Fe 45 Mn 55 /FeCoBNiSi/Al 2 O 3 /FeCoBNiSi/Fe 45 Mn 55 /Ta symmetric MTJ structure was changed with about 6 % in 20 G, leading to a sensitivity of about 0.3%/G. This structure exhibits a TCR value of about 60 ppm/°C.