In this Letter, we propose a technique for hysteresis loop measurement based on weak measurement. By using the photonic spin Hall effect (PSHE) as a probe and combining the quantum weak measurement, the technique's noise can be suppressed greatly. A theoretical model to describe the numerical relation between the amplified shift and Kerr rotation angle is established. Through detecting the amplified shift of the PSHE based on weak measurement, we experimentally measure the hysteresis loops of Ni-Fe alloy film, iron-phthalocyanine (FePc) monolayer film, and Co/FePc double-layer film. The results show that the precision can reach about $ \sim {10^{ - 6}} \;{\rm rad} $∼10-6rad under ordinary experimental conditions, which may have an important application prospect in magneto-optic parameters measurement.

中文翻译：

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基于弱测量的磁滞回线测量。

在这封信中，我们提出了一种基于弱测量的磁滞回线测量技术。通过使用光子自旋霍尔效应（PSHE）作为探针并结合量子弱测量，可以大大抑制该技术的噪声。建立了理论模型来描述放大位移与克尔旋转角之间的数值关系。通过基于弱测量检测PSHE的放大位移，我们通过实验测量了Ni-Fe合金膜，铁酞菁（FePc）单层膜和Co / FePc双层膜的磁滞回线。结果表明，在常规实验条件下，精度可以达到约$ \ sim {10 ^ {-6}} \; {\ rm rad} $〜10-6rad，在磁光参数测量中具有重要的应用前景。 。