Quantitative analysis of magnetic properties in nanowires based on wide-field diamond NV magnetometry

Wide-field magnetometry based on diamond nitrogen-vacancy (NV) centers has been used to image solid-state magnetic materials, current-flowing devices, magnetic particles or nuclear spins in biomedical samples etc. Here, we use a custom-built ambient wide-field diamond magnetometer to study magnetic properties of various nanowires including Fe, Co, Fe-Au alloy, etc. From the magnitude and spatial distribution of static magnetic field around nanowires, we are able to extract magnetization of individual ferromagnet nanowires which varies depending on relative size, material composition and so on. The imaging technique can provide quantitative analysis method of studying magnetism in various nanostructures.