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We study cross-relaxation features near zero magnetic field with ensembles ofnitrogen-vacancy (NV) centers in diamond and examine their properties insamples with a range (0.9 ppm - 16.0 ppm) of NV concentrations. The observedNV-NV cross-relaxation features between differently oriented NV centers inhigh-NV-density samples hold promise for a variety of magnetometry applicationswhere microwave fields (or any bias field) disturb the system under study. Wetheoretically determine the values of the bias magnetic fields corresponding tocross-relaxations between different axes and experimentally validate them. Thebehavior of zero-field cross-relaxation features as a function of temperatureis also investigated. The sensitivity of magnetometry based on this method isdetermined to be in the 10 nT/sqrt(Hz) range.

Zero-field microwave-free magnetometry with ensembles of nitrogen-vacancy centers in diamond