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http://hdl.handle.net/2122/14311
Authors: | Finocchio, Giovanni* Moriyama, T* De Rose, Raffaele* Siracusano, Giulio* Puliafito, Vito* Chiappini, Stefano* Crupi, Felice* Zeng, Zhongming* Ono, T* Carpentieri, Mario* Lanuzza, Marco* |
Title: | Spin-orbit torque based physical unclonable function | Journal: | Journal of Applied Physics | Series/Report no.: | /128 (2020) | Publisher: | AIP | Issue Date: | 15-Jul-2020 | DOI: | 10.1063/5.0013408 | Keywords: | physics.app-ph; physics.app-ph; Physics - Mesoscopic Systems and Quantum Hall Effect | Subject Classification: | 03.01. General | Abstract: | This paper introduces the concept of spin-orbit-torque-MRAM (SOT-MRAM) based physical unclonable function (PUF). The secret of the PUF is stored into a random state of a matrix of perpendicular SOT-MRAMs. Here, we show experimentally and with micromagnetic simulations that this random state is driven by the intrinsic nonlinear dynamics of the free layer of the memory excited by the SOT. In detail, a large enough current drives the magnetization along an in-plane direction. Once the current is removed, the in-plane magnetic state becomes unstable evolving towards one of the two perpendicular stable configurations randomly. In addition, an hybrid CMOS/spintronics model is used to evaluate the electrical characteristics of a PUF realized with an array of 16x16 SOT-MRAM cells. Beyond robustness against voltage and temperature variations, hardware authentication based on this PUF scheme has additional advantages over other PUF technologies such as non-volatility (no power consumption in standby mode), reconfigurability (the secret can be rewritten), and scalability. We believe that this work is a step forward the design of spintronic devices for application in security. | Description: | 18 pages, 7 figures |
Appears in Collections: | Article published / in press |
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