A Reconfigurable Arbiter PUF Based on VGSOT MTJ

Abstract

AbstractWith the serious scaling limitations of complementary metal-oxide-semiconductor technology, emerging spintronic devices have attracted recent attention for next-generation energy-efficient and secure systems. Voltage-Gated Spin-Orbit Torque (VGSOT) based Magnetic Tunnelling Junction (MTJ) device is proved to show lower energy consumptions with stochastic switching, process variations, and chaotic magnetization. Exploiting these intrinsic variations, this paper for the first time presents a reconfigurable arbiter physically unclonable function (PUF). Further, the PUF functionality is validated considering VGSOT MTJ and 45nm CMOS technology. Considering the state of VGSOT devices, the proposed PUF is observed to be fully reconfigurable. Considering the abilities of VGSOT, PUF shows higher uniqueness of 50.2% at a supply voltage of 0.8V. Additionally, PUF achieves high reliability of 95.8% considering supply voltage and temperature variations. Moreover, at a supply voltage of 0.8V, the proposed PUF achieves lower energy consumption of 24fJ/bit.KeywordsSpintronicsVoltage-Gated Spin-Orbit Torque (VGSOT)Magnetic Tunnelling Junction (MTJ)Hardware SecurityPhysically Unclonable Function (PUF)