Luan, LanGrinolds, Michael S.Hong, SungkunMaletinsky, PatrickWalsworth, RonaldYacoby, Amir2015-03-022015Luan, Lan, Michael S. Grinolds, Sungkun Hong, Patrick Maletinsky, Ronald L. Walsworth, and Amir Yacoby. 2015. “Decoherence imaging of spin ensembles using a scanning single-electron spin in diamond.” Scientific Reports 5 (1): 8119. doi:10.1038/srep08119. http://dx.doi.org/10.1038/srep08119.2045-2322http://nrs.harvard.edu/urn-3:HUL.InstRepos:14065397The nitrogen-vacancy (NV) defect center in diamond has demonstrated great capability for nanoscale magnetic sensing and imaging for both static and periodically modulated target fields. However, it remains a challenge to detect and image randomly fluctuating magnetic fields. Recent theoretical and numerical works have outlined detection schemes that exploit changes in decoherence of the detector spin as a sensitive measure for fluctuating fields. Here we experimentally monitor the decoherence of a scanning NV center in order to image the fluctuating magnetic fields from paramagnetic impurities on an underlying diamond surface. We detect a signal corresponding to roughly 800 μB in 2 s of integration time, without any control on the target spins, and obtain magnetic-field spectral information using dynamical decoupling techniques. The extracted spatial and temporal properties of the surface paramagnetic impurities provide insight to prolonging the coherence of near-surface qubits for quantum information and metrology applications.en-USJournal Article2015-03-0210.1038/srep08119