Mapping AC Susceptibility with Quantum Diamond Microscope
Abstract
We present a novel technique for determining the microscale AC susceptibility of magnetic materials. We use magnetic field sensing properties of nitrogen-vacancy (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 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 NV- centers. We demonstrate our experimental technique by measuring the AC susceptibility of soft permalloy micro-magnets at excitation frequencies of up to 20 with a spatial resolution of 1.2 and a field of view of 100. Our work paves the way for microscopic measurement of AC susceptibilities of magnetic materials relevant to physical, biological, and material sciences.
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