Purely Electrical Controllable Spin–Orbit Torque‐Based Reconfigurable Physically Unclonable Functions

In the field of information hardware security, random variations obtained during device manufacturing process play a key role in generating unique and unclonable security keys. Existing physical functions (PUFs) utilizing these static randomnesses usually exhibit challenge-response pairs, which cannot be refreshed limit their application prospects. Here, it is demonstrated that purely electrical controllable spin–orbit torque (SOT)-based reconfigurable PUFs (rPUFs) can realized Pt/IrMn/Co/Ru/CoPt heterojunctions. By applying current pulses along two orthogonal directions, both exchange bias between IrMn Co SOT switching polarity (clockwise or counterclockwise) perpendicularly magnetized CoPt reversibly controlled, enables realization four rPUF states within single device. taking advantages sample growth micro-nanofabrication induced critical density SOT-driven magnetization switching, with relatively good uniqueness low bit error rate achieved. Our work provides an approach to broadens spintronics.