NMR Spin Echo Study of Domain Wall Pinning in Lithium Ferrite in Combination with an Additional Magnetic Video-pulse

NMR spin echo at application of an additional magnetic video-pulse is a convenient method to study the domain wall pinning in magnetic materials. Domain wall pinning is the critical amplitude of the magnetic video-pulse below which the domain wall fixed. For its assessment, two alternative NMR methods were chosen. In the first case, the pinning of domain wall was measured by the action of magnetic video-pulse on a two-pulse echo signal, and in the second one, the pinning was measured at the combined action of magnetic video-pulse and radiofrequency pulses on the nuclear spin system in domain wall during the process of formation a single-pulse echo, by means of generation of the so-called magnetic echo signal.