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

Abstract

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 ‘antisit’ defects (Y³⁺ ions on Fe³⁺ sites) in nominally pure YIG. The influences of the diamagnetic substitution on the hyperfine field 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 effects within a 15% tolerance interval was verified.