Abstract
Changes in local magnetic fields on 57Fe nuclei of Fe3+ ions in bipyramidal (2b) and tetrahedral (4f1) positions of the BaFe12O19 hexaferrite with variations in temperature are investigated using nuclear magnetic resonance in the temperature range 4.2–295 K. The applicability of the Bloch spin wave theory to the description of the thermal behavior of local magnetic fields on 57Fe nuclei is considered. Low-temperature deviations from the Bloch law are revealed for bipyramidal positions. The model describing the dynamics of an iron ion in these positions is refined.
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