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Spin-orbit torque (SOT) magnetic random-access memory (MRAM) is a promising candidate for next-generation memory technologies due to its non-volatility, high speed, and low power consumption. In this letter, we experimentally demonstrate SOT switching in 80 nm IrMn-based perpendicular magnetic tunnel junctions with a pulse width down to 0. 8 ns. Field-free SOT switching is achieved with the assistance of the in-plane exchange bias (EB) generated at the antiferromagnetic/ferromagnetic interface. Remarkably, after 1 10^{10 } bipolar switchings, the stable field-free SOT switching can still be achieved, and the EB field remains at 3. 25 mT, showing a robust EB and reliable SOT switching performance. The introduction of the voltage-controlled magnetic anisotropy effect results in a 35% reduction in power consumption. Furthermore, the voltage-gated SOT devices achieve a low write error rate below 5 10^-5 and a high endurance over 1 10^{11 } cycles. These findings highlight the potential of IrMn-based SOT-MRAM for advanced memory technology applications.
Liu et al. (Wed,) studied this question.