A two-transistor bootstrap type selective device for spin-transfer-torque magnetic tunnel junctions

Two-transistor bootstrap type selective device for spin-transfer-torque magnetic tunnel junctions (STT-MTJs) is proposed that is smaller than the conventional ones with equivalent performance. The power supply voltage dependence of the area for the two-NFET bootstrap type selective device that can switch MTJs within 10 ns is compared with those of the conventional single-NFET, single-PFET, and CMOS type selective devices with the same performance in 90nm technology node. It is found that the two-NFET bootstrap type selective device can be smaller than the conventional ones especially for the power supply voltage equal to or lower than 0.9V. The two-NFET bootstrap type selective device is shown to maintain scalability to 32nm node just like the CMOS one, while the conventional single-NFET and single-PFET selective devices fail to be scaled properly. This selective device can be applied to every high-performance MOS/MTJ hybrid circuit for increasing the integration density.