Physically Unclonable Functions With Voltage-Controlled Magnetic Tunnel Junctions
Yuji Tanaka, Minori Goto, Amit Kumar Shukla, Kohei Yoshikawa, Hikaru Nomura, Shinji Miwa, S. Tomishima, Yoshishige Suzuki
Abstract
We demonstrated for the first time physically unclonable functions (PUFs) based on voltage-controlled magnetic tunnel junctions (VC-MTJs). The proposed PUF completely extracts the intrinsic variation of magnetization switching in the VC-MTJ as a random bit string without a short pulse, which is required in the spin-transfer torque (STT) MTJ and spin-orbit torque (SOT) MTJ-based PUF. Moreover, it can be initialized by a bias voltage without an external magnetic field. Using 40 MTJs fabricated in the same design, we evaluated the PUF fundamental parameters: uniqueness, reliability, and uniformity as 57.5%, 87.1%, and 45.0%, respectively.