Universal Low Power-Driven Logic Gates Based on Synthetic Antiferromagnetic Skyrmions
ORAL
Abstract
Skyrmion-based logic gates and circuits offer promising non-volatility and high-density logic and memory operations over conventional CMOS technologies. Skyrmion-based logic gates and circuits utilize these topologically protected magnetic nanoscale features in many ferromagnetic (FM) systems. However, in such systems, skyrmions suffer from the transverse motion caused by the skyrmion Hall effect (SkHE), which prevents their operations in longitudinal nano tracks and cascadable logic circuits. Here, we present a micromagnetic modeling study on designing low-energy logic gates that utilize skyrmions in ferromagnetic interfaces that are synthetic antiferromagnetically (SAF) coupled and have been systematically studied and stabilized earlier [2]. This study uses micromagnetic models to design and demonstrate SAF skyrmion logic gates and circuits based on current-driven skyrmion and skyrmion-domain wall interactions. In this work, we first present the SAF skyrmion logic inverter gate's operation and show that it performs better than its FM skyrmion gate counterpart [1]. We show the operation of the inverter block with lower current density magnitudes while maintaining a comparable switching time of 7 ns. Consequently, this is reflected considerably in the Joule heating, reducing to ~ 10-18 J from the FM case of ~10-14 J. Then, we use the inverter gate block to build logic circuits, including NOR, OR, AND, NAND, and multiplexer circuits. Our findings could help build fast, low-energy spintronic computing devices that use nanoscale SAF skyrmions as information carriers without SkHE.
[1] A. Mousavi Cheghabouri, R. Yagan, M. C. Onbasli, Scalable Low-Power Skyrmionic Logic Gate Library. Adv. Theory Simul. 2024, 7, 2400243.
[2] Yagan, R., A.M. Cheghabouri, and M.C. Onbasli, Stabilization and adiabatic control of antiferromagnetically coupled skyrmions without the topological Hall effect. Nanoscale Advances, 2023. 5(17): p. 4470-4479.
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Publication: [1] A. Mousavi Cheghabouri, R. Yagan, M. C. Onbasli, Scalable Low-Power Skyrmionic Logic Gate Library. Adv. Theory Simul. 2024, 7, 2400243. <br>[2] Yagan, R., A.M. Cheghabouri, and M.C. Onbasli, Stabilization and adiabatic control of antiferromagnetically coupled skyrmions without the topological Hall effect. Nanoscale Advances, 2023. 5(17): p. 4470-4479.<br>[3] R. Yagan, A. M. Cheghabouri, A. B. Trabzon, M. C. Onbaşlı, Universal Low Power-Driven Logic Gates Based on Synthetic Antiferromagnetic Skyrmions, (under review) (2024)
