FIGURE 4. Demonstration of magnetic sensing with a single nitrogen-vacancy electronic spin in a diamond nanocrystal.
From the following article:
Nanoscale magnetic sensing with an individual electronic spin in diamond
J. R. Maze, P. L. Stanwix, J. S. Hodges, S. Hong, J. M. Taylor, P. Cappellaro, L. Jiang, M. V. Gurudev Dutt, E. Togan, A. S. Zibrov, A. Yacoby, R. L. Walsworth & M. D. Lukin
Nature 455, 644-647(2 October 2008)
doi:10.1038/nature07279
a, Example of electronic spin-echo signal from a single nitrogen-vacancy centre contained in a diamond nanocrystal with diameter of 34 
12 nm as determined by atomic force microscopy. Maximum signal corresponds to an average number of photons 
n
= 0.02 counted during a 324-ns photon counting window. The arrow indicates the time at which magnetic sensing is performed in b. b, Example of electronic spin-echo signal as a function of BAC at a frequency of 
= 380 kHz. For these data, N = 2 
106 averages of spin-echo sequences were used. The resulting standard deviation yields a magnetometer sensitivity of 0.5 0.1 
T Hz-1/2.
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