Mapping AC Susceptibility with Quantum Diamond Microscope
arXiv:2209.11610 · doi:10.1063/5.0138301
Abstract
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.
References in corpus (6)
- Broadband Magnetometry and Temperature Sensing with a Light Trapping Diamond Waveguide
- Realtime magnetic field sensing and imaging using a single spin in diamond
- A.C. susceptibility as a probe of low-frequency magnetic dynamics
- AC susceptometry of 2D van der Waals magnets enabled by the coherent control of quantum sensors
- High speed microcircuit and synthetic biosignal widefield imaging using nitrogen vacancies in diamond
- An Integrated Widefield Probe for Practical Diamond Nitrogen-Vacancy Microscopy