The role of spin noise in the detection of nanoscale ensembles of nuclear spins

Details The role of spin noise in the detection of nanoscale ensembles of nuclear spins The role of spin noise in the detection of nanoscale ensembles of nuclear spins

2007-10-11

arxiv.org/abs/0710.2323v2

Phys. Rev. Lett. 99, 250601 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.250601

When probing nuclear spins in materials on the nanometer scale, random fluctuations of the spin polarization will exceed the mean Boltzmann polarization for sample volumes below about (100nm)^3. In this work, we use magnetic resonance force microscopy to observe nuclear spin fluctuations in real time. We show how reproducible measurements of the polarization variance can be obtained by controlling the spin correlation time and rapidly sampling a large number of independent spin configurations. A protocol to periodically randomize the spin ensemble is demonstrated, allowing significant improvement in the signal-to-noise ratio for nanometer-scale magnetic resonance imaging.

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