The impact of a low-frequency magnetic field on the properties of the main and additional echo signals in manganese ferrite

An experimental study of the features of additional echo signal formation is described, the mechanism of which is different from the classical Hahn mechanism, in the Mn_xFe_2-xO₄ system at helium temperatures. It was found that in the Mn_xFe_2-xO₄ system, the maximum intensity of the additional echo corresponds to a ferrite having a minimum magnetocrystalline anisotropy. Exposure to a low-frequency magnetic field led to the detection of the correlation effect between the changes of the main and additional signals in manganese ferrite, at helium temperatures. This indicates that they have an intra-boundary origin, which contradicts the known interpretations of manganese ferrite NMR spectrum. The possible physical nature of the observed effect is discussed.