Optical Verification of Physically Unclonable Function Devices Based on Spin-Orbit Torque Switching

Jeong Kyu Lee, Jiyoung Lee, Seok In Yoon, Min Hyeok Lee, Jin Seo Lee, Yunho Jang, Dae Yun Kim, Sug Bong Choe, Jongsun Park, Young Keun Kim

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Physically unclonable functions (PUFs) are used for various applications such as anticounterfeiting, authentication, and secret key generation. They are generally evaluated through electrical measurements, requiring much time and effort due to the many electrical connections required. This study proposes an optical verification of spin-orbit torque (SOT) devices for PUF design. SOT devices have gained much attention because they resist degradation and thermal changes and can generate secret keys with high reproducibility. A simple optical method based on the magneto-optical Kerr effect is introduced to verify the authenticity of the proposed SOT PUF device. Furthermore, this study assesses the feasibility of using a W/CoFeB/MgO/Ta structure as a PUF. The 24-bit device shows a reliability of 97.8 ± 1.03%, making it a promising candidate for use as a spintronics-based PUFs.

Original languageEnglish
Article number2300056
JournalAdvanced Electronic Materials
Volume9
Issue number7
DOIs
Publication statusPublished - 2023 Jul

Bibliographical note

Funding Information:
This study was supported by the National Research Foundation (NRF) of Korea, funded by the Ministry of Science and ICT (2020M3F3A2A01082591 and 2022M3H4A1A04096339) and the Samsung Electronics Co., Ltd. (IO201211‐08104‐01).

Publisher Copyright:
© 2023 The Authors. Advanced Electronic Materials published by Wiley-VCH GmbH.

Keywords

  • electronic devices
  • magneto-optical Kerr effect
  • physically unclonable functions
  • reliability
  • secret keys
  • spin-orbit torque

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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