H. Stepankova et al., Fe-57 hyperfine field anisotropy in ferrites and its relation to the non-uniformity of the ionic surrounding, ACT PHY P A, 97(5), 2000, pp. 757-760
The hyperfine field anisotropy tensors, obtained from analysis of Fe-57 NMR
spectra for iron sites in various magnetic oxides (barium hexaferrite, lit
hium spinel, magnetite and yttrium-iron garnet) were used to investigate th
e relation between the hf anisotropy and surrounding ionic arrangement. Whi
le a reasonable correlation has been found when the distribution of the nea
rest cations was considered, no correlation was obtained between the hyperf
ine field anisotropy and the positions of the nearest oxygen anions.