Lee, Soogil Kang, Jaimin Kim, Jeong-Mok Kim, Namhee Han, Donghyeon Lee, Taekhyeon Ko, San Yang, Jiseok Lee, Sanghwa Lee, Sungjun Koh, Daekyu Kang, Min-Gu Lee, Jisung Noh, Sujung Lee, Hansaem Kwon, JoonHyun Baek, Seung-Heon Chris Kim, Kab-Jin Park, Byong-Guk 2024-01-19T11:00:31Z 2024-01-19T11:00:31Z 2022-10-27 2022-11 0935-9648 https://pubs.kist.re.kr/handle/201004/114413 Physical unclonable function (PUFs) utilize inherent random physical variations of solid-state devices and are a core ingredient of hardware security primitives. PUFs promise more robust information security than that provided by the conventional software-based approaches. While silicon- and memristor-based PUFs are advancing, their reliability and scalability require further improvements. These are currently limited by output fluctuations and associated additional peripherals. Here, highly reliable spintronic PUFs that exploit field-free spin-orbit-torque switching in IrMn/CoFeB/Ta/CoFeB structures are demonstrated. It is shown that the stochastic switching polarity of the perpendicular magnetization of the top CoFeB can be achieved by manipulating the exchange bias directions of the bottom IrMn/CoFeB. This serves as an entropy source for the spintronic PUF, which is characterized by high entropy, uniqueness, reconfigurability, and digital output. Furthermore, the device ensures a zero bit-error-rate under repetitive operations and robustness against external magnetic fields, and offers scalable and energy-efficient device implementations. English WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Spintronic Physical Unclonable Functions Based on Field-Free Spin-Orbit-Torque Switching Article 10.1002/adma.202203558 1 Advanced Materials, v.34, no.45 Advanced Materials 34 45 Y scie scopus 000869371400001 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article AUTHENTICATION PUFS exchange bias field-free switching hardware security primitives physical unclonable functions spin-orbit torque