Nuclear magnetic resonance of 57Fe in bismuth–yttrium iron garnets

Abstract

Hyperfine magnetic interaction at iron nuclei in a bismuth-yttrium iron garnet system Bi x Y 3-x Fe 5 O 12 , 0 ≤ x ≤ 3, was studied using nuclear magnetic resonance. 57 Fe NMR spectra were measured by spin echo technique at 4.2 K in zero external magnetic field. The spectrum of bismuth iron garnet film Bi 3 Fe 5 O 12 prepared by ion beam sputtering corresponds to the iron garnet structure having magnetization along [111] direction: two a-lines at 74.00 MHz and 75.05 MHz with the intensity ratio 1:3 assigned to octahedral iron sites and a single d-line at 66.46 MHz of tetrahedral iron sites. The resonant frequencies are slightly shifted in comparison with yttrium iron garnet Y 3 Fe s O 12 . Satellite lines or line broadening appear in spectra of partially substituted samples due to a distribution of Y 3+ and Bi 3+ cations in dodecahedral sites.