论文标题
用量子钻石显微镜映射AC敏感性
Mapping AC Susceptibility with Quantum Diamond Microscope
论文作者
论文摘要
我们提出了一种新的技术，用于确定磁性材料的微观AC敏感性。我们在钻石中使用氮呈（\ ce {nv-}）的磁场传感特性来收集有关正在研究的磁性材料的磁态的定量数据。为了达到成像中必不可少的速度，使用锁定摄像头来执行\ ce {nv-}光亮发光的像素锁定检测。此外，采用二级传感器将激发场与磁结构对\ ce {nv-}中心产生的磁场的影响分离。我们通过以\ si {1.2} {\ micro \米}的空间分辨率测量\ si {20} {\ hertz}的激发频率下的软薄膜微磁体的AC敏感性来证明我们的实验技术。我们的工作为与物理，生物学和材料科学相关的磁性材料的AC敏感性的微观测量铺平了道路。
We present a novel technique for determining the microscale AC susceptibility of magnetic materials. We use magnetic field sensing properties of nitrogen-vacancy (\ce{NV-}) centers in diamond to gather quantitative data about the magnetic state of the magnetic material under investigation. In order to achieve the requisite speed in imaging, a lock-in camera is used to perform pixel-by-pixel lock-in detection of \ce{NV-} photo-luminescence. In addition, a secondary sensor is employed to isolate the effect of the excitation field from fields arising from magnetic structures on \ce{NV-} centers. We demonstrate our experimental technique by measuring the AC susceptibility of soft permalloy micro-magnets at excitation frequencies of up to \SI{20}{\hertz} with a spatial resolution of \SI{1.2}{\micro \meter} and a field of view of \SI{100}{\um}. Our work paves the way for microscopic measurement of AC susceptibilities of magnetic materials relevant to physical, biological, and material sciences.
