Observation of a new coherent transient in NMR -- nutational two-pulse stimulated echo in the angular distribution of \gamma-radiation from oriented nuclei

A new coherent transient in pulsed NMR, the two-pulse nutational stimulated echo, is reported for the ferromagnetic system ⁶⁰CoFe using resonant perturbations on the directional emission of anisotropic \gamma-radiation from thermally oriented nuclei. The new spin echo is a result of non-linear nuclear spin dynamics due to large Larmor inhomogeneity active during radiofrequency pulse application. It is made readily observable through the gross detuning between NMR radiofrequency excitation and gamma radiation detection, and inhomogeneity in the Rabi frequency caused by metallic skin-effect. The method of concatenation of perturbation factors in a statistical tensor formalism is quantitatively applied to successfully predict and then fit in detail the experimental time-domain data. This revised version was published online in August 2006 with corrections to the Cover Date.