This work is a collaboration between the Laboratoire Charles Coulomb in Montpellier, France and the Center for Nanoscience and Nanotechnology in Palaiseau, France. Following our study on synthetic antiferromagnets, we investigated in more details the effect of magnetic noise on the NV center using a bulk diamond sample and a calibrated magnetic noise.
We linked the observed magnetic-noise-induced decrease of the photoluminescence to the competition between the polarization of the NV by the laser and the acceleration of the relaxation by the noise. We developped a simplified three-level-model of the NV center and compared its prediction to experimental data. We get a good agreement between experiment and theory, indicating that although very simple, our model describes correctly the physical process.