A physically unclonable function (PUF) is an embedded hardware security measure that provides protection against counterfeiting. Here we present our work on using an array of randomly-magnetized micron-sized ferromagnetic bars (micromagnets) as a PUF. We employ a 4 $\mu$m thick surface layer of nitrogen-vacancy (NV) centers in diamond to image the magnetic fields from each micromagnet in the array, after which we extract the magnetic polarity of each micromagnet using image analysis techniques. After evaluating the randomness of the micromagnet array PUF and the sensitivity of the NV readout, we conclude by discussing the possible future enhancements for improved security and magnetic readout.

中文翻译：

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使用 NV 金刚石磁力计和微磁阵列的物理不可克隆功能

物理不可克隆功能 (PUF) 是一种嵌入式硬件安全措施，可提供防伪保护。在这里，我们展示了我们使用随机磁化微米尺寸铁磁棒（微磁体）阵列作为 PUF 的工作。我们在金刚石中使用 4 $\mu$m 厚的氮空位 (NV) 中心表面层对阵列中每个微磁体的磁场进​​行成像，然后我们使用图像分析技术提取每个微磁体的磁极性。在评估了微磁阵列 PUF 的随机性和 NV 读数的灵敏度后，我们最后讨论了未来可能的改进以提高安全性和磁性读数。