J. Kohout et al., TEMPERATURE-DEPENDENCE OF THE FE-57 HYPERFINE FIELD IN SUBSTITUTED YTTRIUM IRON GARNETS, Journal of magnetism and magnetic materials, 140, 1995, pp. 2125-2126
The NMR spectra of Fe-57 in YIG:Ga and YIG:In systems were measured be
tween liquid He and room temperature. By comparing the temperature dep
endences of the satellite lines with those of the main lines, conclusi
ons are made about the exchange interactions in YIG.