A reliable design of physical unclonable function (PUF) based on spin-orbit torque (SOT) induced domain wall (DW) motion has been proposed and experimentally demonstrated. Magnetic DWs are nucleated and propagate in Ta/CoFeB/MgO heterostructures in which their device-to-device variation enables the PUF, while cycle-to-cycle variation in DW motion enables the reconfigurable design. Furthermore, field-free SOT switching has been observed in the chiral domain wall likely caused by the large Dzyaloshinskii-Moriya interaction (DMI) effect. The proposed DW motion based anti-counterfeiting device shows good promises as a CMOS-compatible PUF for hardware security.

中文翻译：

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基于自旋轨道转矩手性域壁运动的可重构物理不可克隆函数

基于自旋轨道转矩（SOT）引起的畴壁（DW）运动的可靠的物理不可克隆函数（PUF）设计已经提出并通过实验证明。磁性DW在Ta / CoFeB / MgO异质结构中成核并传播，其中它们的器件间差异使PUF得以实现，而DW运动的周期间差异则使可重构设计成为可能。此外，在手性畴壁中已观察到无场SOT切换，这可能是由于Dzyaloshinskii-Moriya相互作用大（DMI）效应引起的。拟议的基于DW运动的防伪设备作为与CMOS兼容的PUF在硬件安全方面具有很好的前景。