Antisite defects in lutetium and yttrium iron garnets prepared by liquid mix technique

57Fe NMR spectra of lutetium iron garnet (LuIG) and yttrium iron garnet (YIG) samples prepared by liquid mix process were measured at 4.2 and 77 K. We detected and identified patterns of satellite lines induced by lutetium antisite defects Lu(a) in LuIG and yttrium antisite defects Y(a) in YIG. Frequency shifts of satellite lines induced by Lu(a) were smaller compared to shifts of corresponding satellite lines induced by Y(a). Concentration of the defects determined from intensities of spectral lines was significantly higher for Lu(a) in LuIG than for Y(a) in YIG.