Abstract
NMR of 57 Fe nuclei is used to study the Y antisite defects (yttrium ions on the sites nominally occupied by iron) in yttrium-iron garnet (YIG). In spectra of both tetrahedral and octahedral Fe 3+ ions, satellite lines appear, corresponding to Fe 3+ ions with this defect in their vicinity. NMR was measured on a number of nominally pure YIG samples - single crystals, thin films as well as polycrystalline samples. The content X Y per formula unit of the Y antisite defect (Y a ) was determined from the amplitude of the satellite lines and it lies in the interval 0.001< x y < 0.03. In most cases the satellite lines caused by the Y a defect are obscured by the satellites originating from other impurities. In two high purity single crystals the satellites caused by Y a dominate, however. In the NMR spectra of these single crystals the satellite lines which correspond to the Felt ions in seven different crystallographically inequivalent positions with respect to the defect are resolved at low temperatures. Further unresolved satellites emerge from the main lines as the temperature is increased.
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