Journal
PHYSICAL REVIEW B
Volume 87, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.235436
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Funding
- C'Nano Ile-de-France
- ANR project Diamag
- ANR project Advice
- ANR project Qinvc
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We report an experimental study of the longitudinal relaxation time (T-1) of the electron spin associated with single nitrogen-vacancy (NV) defects hosted in nanodiamonds (NDs). We first show that T-1 decreases over three orders of magnitude when the ND size is reduced from 100 to 10 nm owing to the interaction of the NV electron spin with a bath of paramagnetic centers lying on the ND surface. We next tune the magnetic environment by decorating the ND surface with Gd3+ ions and observe an efficient T-1 quenching, which demonstrates magnetic noise sensing with a single electron spin. We estimate a sensitivity down to approximate to 4 electron spins detected within 10 s, using a single NV defect hosted in a 10-nm-size ND. These results pave the way towards T-1-based nanoscale imaging of the spin density in biological samples.
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