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Pulsed gradient NMR probes for solid state studies

W Zhang1, D G Cory

  • 1Department of Nuclear Engineering, Massachusetts Institute of Technology, Cambridge 02139, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|June 6, 1998
PubMed
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Researchers developed novel Nuclear Magnetic Resonance (NMR) probes capable of generating strong magnetic field gradients. These advanced probes enable precise measurements of spin diffusion rates in materials like CaF2.

Area of Science:

  • Solid-state physics
  • Materials science
  • Nuclear Magnetic Resonance (NMR) spectroscopy

Background:

  • Studies of spin dynamics in solids utilize NMR probes with strong magnetic field gradients.
  • These probes create spatial magnetization gratings for scattering experiments.
  • Spin coherence displacement is measured as phase shift or attenuation.

Purpose of the Study:

  • To discuss designs for strong pulsed gradient NMR probes.
  • To enable direct measurement of spin diffusion rates.
  • To address practical considerations in probe construction and stability.

Main Methods:

  • Designed and constructed three gradient coil sets with varying coil constants (0.32, 0.67, and 4.15 T/m/A).
  • Utilized a pulsed current source delivering up to 300 A to generate pulsed magnetic field gradients.

Related Experiment Videos

  • Employed scattering experiments to measure spin diffusion rates in single crystal CaF2.

    • Main Results:

    • Generated pulsed gradients of 100, 200, and 600 T/m.
    • Successfully performed direct measurements of spin diffusion rates.
    • Evaluated practical issues including coil heating and probe stability.

    Conclusions:

    • The developed strong pulsed gradient NMR probes are effective for studying spatial spin dynamics.
    • The probe designs offer high gradient strengths suitable for nanoscale measurements.
    • Practical aspects of probe performance and stability have been addressed.