论文标题
纳米级三维磁传感，概率纳米磁体由旋转轨道扭矩驱动
Nanoscale three-dimensional magnetic sensing with a probabilistic nanomagnet driven by spin-orbit torque
论文作者
论文摘要
在纳米级维度的矢量磁场检测对于从基本材料科学到医学诊断的应用至关重要。同时，全电动操作对于实现简单而紧凑的传感系统具有重要意义。在这里，我们提出并在实验上展示了一种简单的方法，可以通过监测概率纳米磁体从亚稳态状态的过渡概率来传感纳米级维度处的向量磁场，这是由于SOT引起的驱动电流而激发的。我们对HX，HY和Hz的敏感性分别为1.02％/OE，1.09％/OE和3.43％/OE，具有200 x 200 nm^2纳米磁铁。最小可检测的场取决于驱动脉冲事件n，如果n = 3 x 10^6，则预计将低至1 UT。
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.
