Proton spin diffusion in a nanodiamond

We report on a proton magnetic resonance study of a powder nanodiamond sample. We show that 1H spin-lattice relaxation in this compound is mainly driven by the interaction of nuclear spins with unpaired electron spins of paramagnetic defects. We measured the spin-lattice relaxation time T1 by means...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2014-04, Vol.26 (16), p.165301-165301
Main Author: Panich, A M
Format: Article
Language:English
Subjects:
Condensed matter
Diffusion
Diffusion barriers
Electron spin
Magnetic fields
nanodiamond
Nanostructure
NMR
Saturation
spin diffusion
Spin-lattice relaxation
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Summary:We report on a proton magnetic resonance study of a powder nanodiamond sample. We show that 1H spin-lattice relaxation in this compound is mainly driven by the interaction of nuclear spins with unpaired electron spins of paramagnetic defects. We measured the spin-lattice relaxation time T1 by means of a saturation comb pulse sequence followed by dipolar dephasing, and plotted T1 as a function of the dephasing time in different external magnetic fields. The received T1( ) dependence provides a striking manifestation of the spin diffusion-assisted relaxation regime. The obtained experimental data allow us to estimate the spin diffusion coefficient and spin diffusion barrier radius.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/26/16/165301