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Long-range magnetic interactions in highly magnetised liquids(laser-polarised 3He-4He dilute mixtures at 1 K in our experiment) introduce asignificant non-linear and non-local contribution to the evolution of nuclearmagnetisation that leads to instabilities during free precession. We recentlydemonstrated that a multi-echo NMR sequence, based on the magic sandwich pulsescheme developed for solid-state NMR, can be used to stabilise themagnetisation against the effect of distant dipolar fields. Here, we reportinvestigations of echo attenuation in an applied field gradient that show thepotential of this NMR sequence for spin diffusion measurements at highmagnetisation densities.

NMR Time Reversal Experiments in Highly Polarised Liquid 3He-4He Mixtures