Nuclear Magnetic Resonance ofNi61in Nickel Metal

The zero-applied-field nuclear magnetic resonance of ${}_{}{}^{61}{}_{}{}^{}\mathrm{Ni}$ in high purity, well-annealed Ni metal has been investigated at room temperature. The technique of rotary saturation is used to obtain a value for the domain-wall enhancement factor $\eta =1600\mathrm{}$. Fast passage and saturation effects are observed and interpreted according to theories developed by Portis for inhomogeneously broadened spin systems. This analysis leads to a value for the longitudinal relaxation time $T_1=0.16\mathrm{}$ msec, and to an observed nuclear dispersion-to-absorption ratio in the power absorbed of ${\beta }_0=0.5\mathrm{}$ at low rf levels. Fast-passage effects are used to obtain a tracing of the distribution of nuclear magnetic fields in the sample.