Resonant excitation of single-pulse nuclear spin echo in magnetically ordered media |
| |
Authors: | V. S. Kuz’min and V. M. Kolesenko |
| |
Affiliation: | (1) A. D. Sakharov International State University of Radioecology, Minsk, Belarus;(2) Scientific-Practical Materials Research Centre, National Academy of Sciences of Belarus, 19 P. Brovka St., Minsk, 220072, Belarus |
| |
Abstract: | An analytical expression for a single-pulse nuclear echo signal in magnetically ordered materials has been obtained taking into account inhomogeneous broadening of the spectroscopic transition and non-uniform distribution of the enhancement factor. The signal has been shown to result from superimposing the nuclear magnetic moment oscillations of the same amplitude and phase that arise upon termination of a radio-frequency pulse. The cause for the effective suppression of oscillations of nuclear magnetic moments in the initial phase of the free precession signal has been determined analytically. The single-pulse echo signal amplitude has been found as a function of the external variable magnetic field strength, the exciting pulse duration, the inhomogeneous NMR line broadening, and the distribution width of the enhancement factor. The results have been compared with experimental data observed in a Co2MnSi ferromagnetic polycrystalline sample. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 76, No. 3, pp. 387–394, May–June, 2009. |
| |
Keywords: | nuclear magnetic resonance single-pulse ferromagnetic echo signal Co2MnSi-like ferromagnetic polycrystalline substances inhomogeneous broadening of spectroscopic transition inhomogeneous distribution of enhancement factor |
本文献已被 SpringerLink 等数据库收录! |
|