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Reconfigurable physical unclonable cryptographic primitives based on current-induced nanomagnets switching

Science China(Information Sciences) 2022年第2期65卷 188-196页

作者： Shuai ZHANG Jian ZHANG Shihao LI Yaoyuan WANG Zhenjiang CHEN jeongmin hong Long YOU Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and Technology

Hardware security primitives that preserve secrets are playing a crucial role in the Internet-ofThings(Io T) era. Existing physical unclonable function(PUF) instantiations, exploiting static randomness,generate challenge-response pairings(CRPs) to produce unique security keys that can be used to authenticate devices linked to the Io T. Reconfigurable PUFs(RPUFs) with dynamically refreshable CRPs can enhance the security and robustness of conventional PUFs. The in-plane current-driven perpendicular polarized nanomagnet switching via spin-orbit torque(SOT) possesses great potential for application to memory and logic, as the write-current path is separate from the read-current path, which naturally resolves the write-read interference. However, the stochastic switching of perpendicular magnetization, without an additional symmetry-breaking field, would significantly hinder the technological viability of commercial implementations. Here, we report an initialization-free physical RPUF implemented by SOT-induced stochastic switching of perpendicularly magnetized Ta/Co Fe B/Mg O nanodevices. Using a 15×15 nanomagnet array, we experimentally demonstrate a security primitive that offers a near-ideal 50% uniqueness over 100 reconfiguration cycles, as well as a low correlation coefficient between every two reconfiguration cycles. Our results show that current-induced nanomagnets switching paves the way for developing highly reliable and energy-efficient reconfigurable cryptographic primitives with a smaller footprint.

关键词： reconfigurable physical unclonable function spin-orbit torque cryptographic primitive spintronics nanomagnet

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Controlled nano-cracking actuated by an in-plane voltage

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Science China(Information Sciences) 2021年第8期64卷 264-266页

作者： Qiang LUO Zhe GUO Shuai ZHANG Xiaofei YANG Xuecheng ZOU jeongmin hong Long YOU School of Optical and Electronic Information Huazhong University of Science and Technology

Dear editor,Cracking has been generally regarded as an undesirable phenomenon to be avoided owing to their highly stochastic process and irreversibility. However, to induce nanocracks deliberately has been widely investigated because of their great potential for extended applications, such as strain sensors[1], flexible electronics [2] and nano-fabrication [3].

关键词： PMN Controlled nano-cracking actuated by an in-plane voltage

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Spectroscopic Studies of 50Bi2O3-(50 - x)B2O3-xSm2O3Glasses System

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New Journal of Glass and Ceramics 2013年第1期3卷 6-10页

作者： Suwat Rakpanich Jakrapong Kaewkhao Kittipun Boonin jeongmin Park hong Joo Kim Pichet Limsuwan Center of Excellence in Glass Technology and Materials Science Nakhon Pathom Rajabhat University Nakhon Pathom Thailand Department of Physics Faculty of Science King Mongkut’s University of Technology Thonburi Bangkok Thailand Department of Physics Kyungpook National University Daegu South Korea

Sm3+ doped bismuth borate glasses of the composition (50 - x)B2O3:50Bi2O3:xSm2O3 (where x = 0.00, 0.50, 1.00, 1.50, 2.00 and 2.50 mol%) have been synthesized by conventional melt quenching technique. In order to understand the role of Sm2O3 inbismuth borate glasses, the density, the molar volume, the refractive index and the optical absorption were investigated. The results show that density, molar volume and refractive index of glasses increased with increasing Sm2O3 concentration. The increase of molar volume with Sm2O3 concentration is due to increase of non-bridging oxy- gen (NBOs) in the glass matrices. The optical absorption spectra were measured in the wavelength range 300 - 1100 nm and the optical band gaps were determined. It was found that the optical band gap decreased with the increase of Sm2O3 concentration. Moreover, the X-rays luminescence of Sm2O3 glasses samples were measured and shows emission band at 4G5/2→6H5/2 (569 nm),4G5/2→6H7/2 (598 nm),4G5/2→6H9/2 (641 nm) and4G5/2→6H11/2 (705 nm).

关键词： Samarium Luminescence Optical Properties Density

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