SITE PREFERENCE OF BI IN YIG-BI THIN-FILMS DETERMINED BY NMR OF FE-57

NMR of Fe-57 in Y3-xBixFe5O12 garnet thin films with [111] orientation was measured at liquid-helium temperature by the spin-echo method. Th e satellite lines corresponding to those Fe3+ ions in the vicinity of which one yttrium ion was replaced by bismuth ion were observed in the NMR spectra. Using the superposition model for the transferred hyperf ine field a correspondence was established between the satellite lines and the specific dodecahedral sites occupied by Bi3+ ions. By an anal ysis of the intensity of the satellite lines the fractions of Bi3+ on different dodecahedral sites were then determined.