Mechanical detection of nuclear spin relaxation in a micron-size crystal

Details Mechanical detection of nuclear spin relaxation in a micron-size crystal Mechanical detection of nuclear spin relaxation in a micron-size crystal

2000-02-25

arxiv.org/abs/cond-mat/0002404v1

Physics

Condensed Matter

latex drafteps.tex, 13 files, 12 pages [SPEC-S00/010], submitted to Eur. Phys. J. B

Scientific paper

10.1007/s100510070160

A room temperature nuclear magnetic resonance force microscope (MRFM), fitted in a $^1$Tesla electromagnet, is used to measure the nuclear spin relaxation of $^1$H in a micron-size (70ng) crystal of ammonium sulfate. NMR sequences, combining both pulsed and continuous wave r.f. fields, have allowed us to measure mechanically $T_2$ and $T_1$, the transverse and longitudinal spin relaxation times. Because two spin species with different $T_1$ values are measured in our $7\mu{\rm m}$ thick crystal, magnetic resonance imaging of their spatial distribution inside the sample section are performed. To understand quantitatively the measured signal, we carefully study the influence of the spin-lattice relaxation and the non-adiabaticity of the c.w. sequence on the intensity and time dependence of the detected signal.

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