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The quantum-mechanical calculations of intensities and time moments ofappearance of multiple spin echo signals of excitation of nuclear spin systemof magnet by two arbitrary width radio-frequency pulses were carried out. Thismethod was used by us earlier at consideration of multiple-pulse analogs ofsingle-pulse echo in multidomain magnets upon sudden jumps of the effectingmagnetic field in the rotating coordinate system during the action ofradio-frequency pulse. The formation mechanisms of echo signals are discussed.The appearance of four primary stimulated echo signals is predicted. The totalnumber of echo signals at fixed parameters of radio-frequency pulses does notexceed thirteen ones. Theoretical conclusions are in compliance withexperiments carried out on lithium ferrite. As it was established by us earlierin this magnetic dielectric, in difference from ferrometals, it is observedvery short relaxation times of single-pulse and two-pulse stimulated echoes,and the contribution of radio-frequency pulse fronts distribution mechanism isinsignificant. For this reason lithium ferrite is a good material for theexperimental verification of theoretical conclusions in experimental conditionsmost close to the theoretical model.

Investigation of multiple echo signals formation mechanism in magnet at excitation by two arbitrary radio-frequency pulses