The NMR Inversion Echo Analog Formed in the Rotating Coordinate System of Magnets

The inverse NMR echo in the laboratory coordinate system was first observed in cobalt nanofilms. In this work, we study its analog, which is formed in a rotating coordinate system in cobalt micropowders and lithium-zinc ferrite. The response of nuclear spin-system in the domain walls of multidomain lithium-zinc ferrite and cobalt micropowders to the combined action of RF and magnetic videopulses was studied. It results in the formation of echo which response could be treated as an analog of the inversion echo in the rotating coordinate system. An evaluation of the domain wall pinning force in the multidomain magnets is provided by the magnetic videopulse's amplitude, which corresponds to the appearance of this echo signal.