Recently introduced studies of the spatial characteristics of spin ducting solenoid for subsurface imaging of solids. Kimmich dynamics in dipolarly coupled solids rely upon NMR probes with et al. (6) used the fringe fields of 10 and 42 T/m of superconstrong magnetic field gradients to create spatial magnetization ducting magnets for measuring small self-diffusion coeffigratings with periods of from 1 mm to 1 nm. The measurements cients, including studies (7) with fringe fields of 32 and 60 are carried out as scattering experiments where the spatial dis-T/m where spin diffusion was observed in melts of entangled placement of spin coherence is recorded as a phase shift or attenuapolymers. Using force detection, Zu Β¨ger et al. (8) recorded tion of the magnetization grating. Recently we have employed three-dimensional images of an ammonium nitrate sample these techniques to make a direct measurement of the spin diffuwith a gradient of 2200 T/m generated by a small nearby sion rate in single crystal CaF 2 . Here we discuss designs for strong magnetic particle, and Schaff and Veeman (9) have also pulsed gradient NMR probes. Three gradient coil sets were deused force detection with a gradient of 500 T/m generated signed and constructed, with coil constants of 0.32, 0.67, and 4.15 T/m/A. When driven by a pulsed current source that provides up with a somewhat larger magnetic particle. Although static to 300 A, pulsed gradients of 100, 200, and 600 T/m, respectively, gradients have the advantages of high strength, excellent were generated. These designs are fully described, along with pracstability, and no heating, they are difficult to combine with tical issues of coil heating and probe stability. α§ 1998 Academic Press multiple-pulse coherent averaging, since the offset dependence of such methods complicates the creation of a spatially uniform grating. For these applications, pulsed gradients