作者：Sabri Koraltan Christin Schmitt Florian Bruckner Claas Abert Klemens Prügl Michael Kirsch Rahul Gupta Sebastian Zeilinger Joshua M. Salazar-Mejía Milan Agrawal Johannes Güttinger Armin Satz Gerhard Jakob Mathias Kläui Dieter Suess
我们提出了一种新的装置概念，使用自旋轨道力矩来实现磁场传感器，其中我们使用差分测量概念来消除传感器偏移。我们推导了传感器信号的一个简单分析公式，并通过宏观模拟的数值研究证明了其有效性。所提出的概念中的灵敏度和可测量的线性传感范围可以通过改变有效磁各向异性或通过改变注入电流的大小来调节。我们表明，垂直于敏感方向的不期望的扰动场保持了零偏移特性，并且仅略微调制了所提出的传感器的灵敏度。霍尔交叉上的高次谐波电压分析通过实验证实了电流强度的线性和可调谐性。此外，传感器在实验中表现出非消失偏移，我们将其归因于反常的能斯特效应。
We propose a novel device concept using spin-orbit-torques to realize a magnetic field sensor, where we eliminate the sensor offset using a differential measurement concept. We derive a simple analytical formulation for the sensor signal and demonstrate its validity with numerical investigations using macrospin simulations. The sensitivity and the measurable linear sensing range in the proposed concept can be tuned by either varying the effective magnetic anisotropy or by varying the magnitude of the injected currents. We show that undesired perturbation fields normal to the sensitive direction preserve the zero-offset property and only slightly modulate the sensitivity of the proposed sensor. Higher-harmonics voltage analysis on a Hall cross experimentally confirms the linearity and tunability via current strength. Additionally, the sensor exhibits a non-vanishing offset in the experiment which we attribute to the anomalous Nernst effect.
论文链接：http://arxiv.org/pdf/2303.13261v1
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