A Study of the Nature of the NMR Signal in Lithium Ferrite upon Exposure to a Low-Frequency Magnetic Field

The effect of modulation of the decay envelope of the echo signal of 57 Fe nuclei in lithium ferrite is studied experimentally, which demonstrates its intrawall origin. In contrast to cobalt characterized by a large modulating anisotropic component of the hyperfine field, which acts on nuclei in domain walls upon displacement of the latter, the manifestation of strong modulation effect in low anisotropic lithium ferrite with a relatively high mobility of domain walls is possibly caused by additional dynamic modulating effects associated with a high mobility of domain walls in this material.