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arXiv · 2208.08074

Nanoscale three-dimensional magnetic sensing with a probabilistic nanomagnet driven by spin-orbit torque

Shuai Zhang·Shihao Li·Zhe Guo·Yan Xu·Ruofan Li·Zhenjiang Chen·Song Min·Xiaofei Yang·Liang Li·Jeongmin Hong·Xuecheng Zou·Long You
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Abstract

Detection of vector magnetic fields at nanoscale dimensions is critical in applications ranging from basic material science, to medical diagnostic. Meanwhile, an all-electric operation is of great significance for achieving a simple and compact sensing system. Here, we propose and experimentally demonstrate a simple approach to sensing a vector magnetic field at nanoscale dimensions, by monitoring a probabilistic nanomagnet's transition probability from a metastable state, excited by a driving current due to SOT, to a settled state. We achieve sensitivities for Hx, Hy, and Hz of 1.02%/Oe, 1.09%/Oe and 3.43%/Oe, respectively, with a 200 x 200 nm^2 nanomagnet. The minimum detectable field is dependent on the driving pulse events N, and is expected to be as low as 1 uT if N = 3 x 10^6.

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Shuai Zhang, Shihao Li, Zhe Guo, Yan Xu, Ruofan Li, Zhenjiang Chen, Song Min, Xiaofei Yang, Liang Li, Jeongmin Hong, Xuecheng Zou, Long You. 2022-08-17. Nanoscale three-dimensional magnetic sensing with a probabilistic nanomagnet driven by spin-orbit torque. https://arxiv.org/abs/2208.08074

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