Determination of local defect density in diamond by double electron-electron resonance

Magnetic impurities in diamond influence the relaxation properties and thus limit sensitivity of magnetic, electric, strain, temperature sensors based on nitrogen-vacancy color centers. Diamond samples may exhibit significant spatial variations impurity concentrations hindering quantitative analysis pathways. Here, we present a local measurement technique which can be used to determine concentration various species defects by utilizing double electron-electron resonance. This method will help improve understanding physics underlying spin guide development samples, as well offering protocols for optimized sensing.