Spin-Echo Memory Device

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Abstract
A proton‐rich sample placed in a strong inhomogeneous magnetic field of mean strength H 0 was subjected to a pattern of relatively weak radio‐frequency pulses at the Larmor frequency of the protons in the field H 0. The pattern was then recalled by applying a strong rf pulse at a later time as in the spin‐echo technique. It is shown both mathematically and experimentally that such a series of pulses, varying in amplitude can be ``memorized'' by the spin system of protons for times as long as one second and then repeated, preserving both shape and relative amplitude.

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