NITROGEN CONTAINING SINGLE CRYSTAL DIAMOND MATERIALS OPTIMIZED FOR MAGNETOMETRY APPLICATIONS

摘要

A single crystal diamond material comprising: neutral nitrogen-vacancy defects (NV⁰); negatively charged nitrogen-vacancy defects (NV^-); and single substitutional nitrogen defects (N_s) which transfer their charge to the neutral nitrogen- vacancy defects (NV⁰) to convert them into the negatively charged nitrogen-vacancy defects (NV ), characterized in that the single crystal diamond material has a magnetometry figure of merit (FOM) of at least 2, wherein the magnetometry figure of merit is defined by (I) where R is a ratio of concentrations of negatively charged nitrogen-vacancy defects to neutral nitrogen-vacancy defects ([NV^-]/[NV⁰]), [NV^- ] is the concentration of negatively charged nitrogen- vacancy defects measured in parts-per-million (ppm) atoms of the single crystal diamond material, [NV0] is a concentration of neutral nitrogen-vacancy defects measured in parts-per-million (ppm) atoms of the single crystal diamond material, and T₂' is a decoherence time of the NV^- defects, where T₂' is T₂* for DC magnetometry or T₂ for AC magnetometry.