### Session S44: Magnetic and Force Microscopy

2:30 PM–5:18 PM, Wednesday, March 23, 2005
LACC Room: 518

Chair: Mark Hersam, Northwestern University

Abstract ID: BAPS.2005.MAR.S44.1

### Abstract: S44.00001 : Detection and Manipulation of the Statistical Fluctuations in Nuclear Spin Ensembles Using Magnetic Resonance Force Microscopy

2:30 PM–2:42 PM

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#### Authors:

H.J. Mamin
R. Budakian
B.W. Chui
D. Rugar
(IBM Research Division, Almaden Research Center)

We have detected and manipulated the naturally occurring $\sqrt N$ statistical polarization in nuclear spin ensembles using MRFM. We have studied fluorine nuclei in CaF$_{2}$, as well as protons in the polymer PMMA and the protein collagen. The ensembles studied contained of order 10$^{8}$ nuclear spins, corresponding to volumes of order (200nm)$^{3}$, which resulted in statistical polarizations of order 10$^{4}$ net spins. We have also implemented a scheme similar to one proposed by Weitekamp \textit{et al}, in which we suppressed the effect of the statistical uncertainty so as to extract meaningful information from time-averaged measurements. In this way, we have successfully made nutation and transverse spin relaxation measurements in a nominally unpolarized sample of CaF$_{2}$ at low temperatures.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2005.MAR.S44.1