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

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

2010-09-17

arxiv.org/abs/1009.3371v1

Physics

Condensed Matter

Statistical Mechanics

16 pages, 5 figures, 1 table

Scientific paper

The quantum-mechanical calculations of intensities and time moments of appearance of multiple spin echo signals of excitation of nuclear spin system of magnet by two arbitrary width radio-frequency pulses were carried out. This method was used by us earlier at consideration of multiple-pulse analogs of single-pulse echo in multidomain magnets upon sudden jumps of the effecting magnetic field in the rotating coordinate system during the action of radio-frequency pulse. The formation mechanisms of echo signals are discussed. The appearance of four primary stimulated echo signals is predicted. The total number of echo signals at fixed parameters of radio-frequency pulses does not exceed thirteen ones. Theoretical conclusions are in compliance with experiments carried out on lithium ferrite. As it was established by us earlier in this magnetic dielectric, in difference from ferrometals, it is observed very short relaxation times of single-pulse and two-pulse stimulated echoes, and the contribution of radio-frequency pulse fronts distribution mechanism is insignificant. For this reason lithium ferrite is a good material for the experimental verification of theoretical conclusions in experimental conditions most close to the theoretical model.

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