John M. Nichol, Tyler R. Naibert, Eric R. Hemesath, Lincoln J. Lauhon, Raffi Budakian
We report a method for Fourier-transform magnetic resonance imaging of statistically polarized nanoscale samples. Periodic magnetic field gradient pulses, which are generated by ultrahigh current densities in a nanoscale metal constriction, spatially encode the spin density in the sample and create temporal correlations in the spin noise. We demonstrate this technique using a silicon nanowire mechanical oscillator as a force sensor to image 1H spins in polystyrene. We obtain a two-dimensional projection of the sample proton density with approximately 10-nm resolution. Fourier encoding offers better sensitivity than point-by-point techniques for high resolution imaging of statistically polarized samples.
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http://arxiv.org/abs/1302.2977
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