Nuclear Magnetic Resonance Force Microscopy Experiments for Single-Pulse T1 and Real-Space Spin Diffusion Imaging
ORAL
Abstract
We report the design and operation of a Nuclear Magnetic Resonance Force Microscopy (NMRFM) probe for studying 1H resonance in room-temperature liquids, varying T1 with CuSO4 paramagnetic ions. We use contained aqueous samples protected from high vacuum of order 10-6 torr, at which our cantilever quality factors are ~1000-3000, providing a force sensitivity of order 10-15 N. Single-pulse T1 measurements of 50 - 500 ms are obtained during an NMRFM cyclic inversion pulse by monitoring the decay of the spin magnetization during our typically 100 - 300 ms long adiabatic inversion pulse.Spin diffusion information is obtained by first exciting the spins in an ~2 μm resonant slice. We then scan to detect the spin magnetization changing with time over a 10μm long region of sample, and we use that spatial dependence to determine diffusion coefficients.
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Presenters
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Peter W Kampschroeder
University of Texas at Austin
Authors
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Peter W Kampschroeder
University of Texas at Austin
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Yawer B Sagar
University of Texas at Austin
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Devan Shoemaker
Department of Electrical and Computer Engineering, University of Texas at Austin, University of Texas at Austin
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Justin Skweres
University of Texas at Austin
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John T Markert
Department of Physics, University of Texas at Austin, Department of Physics, The University of Texas at Austin, University of Texas at Austin