Dependence of 57Fe Hyperflne Field in Yttrium Iron Garnet on Ionic Radius of Diamagnetic Defects: NMR Study⁄

Satellite structure in 57Fe NMR spectra of In3+, Sc3+, Ga3+ and Al3+ substituted yttrium iron garnets (YIG) was analysed taking into account results previously obtained for ‘antisite’ defects (Y3+ ions on Fe3+ sites) in nominally pure YIG. The in°uences of the diamagnetic substitution on the hyperflne fleld at the neighbouring iron nuclei were found to be remarkably dependent on the ionic radius of the substituent. In the case of two substituents in the vicinity of the resonating iron, an additivity of their efiects within a 15 % tolerance interval was verifled. 1