Temperature dependence of satellite structure of yttrium iron garnet containing Y3+(a) defects and Al3+(d) substitutions: experiment and model

Abstract NMR spectra on 57 Fe nuclei in yttrium iron garnet (YIG) containing Y 3+ (a) defects and Al 3+ (d) substitutions were measured in the temperature range 4.2–360 K in zero external magnetic field. The temperature dependencies of satellite lines caused by Y 3+ (a), Al 3+ (d) impurities were determined. Theoretical description of the temperature behavior of the main and satellite lines has been carried out in the frame of model based on the Bethe–Peierls–Weiss approximation.