11:15 AM - 11:30 AM
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[16a-D704-8] TaFeB spacer for soft magnetic composite free layer in CoFeB/MgO/CoFeB-based
magnetic tunnel junction
Keywords:Magnetic tunnel junction, Tunnel magnetoresistance, Magnetic sensor
CoFeB/MgO/CoFeB-based magnetic tunnel junctions (MTJs) with a soft magnetic composite free layer have been developed for magnetic sensor applications. Tunnel magnetoresistance (TMR) ratios in the sensor-type MTJs have reached a ceiling due to a trade-off between the TMR ratio and interlayer exchange coupling (IEC) depending on the spacer thickness of the composite free layer. In this study, we developed a paramagnetic amorphous TaFeB-alloy spacer to replace the conventional Ta spacer and solve this trade-off.