Abstract:
A sequence of maxima of microwave absorption has been found in the ferromagnetic resonance (FMR) spectra of the chiral molecular ferrimagnet [Mn$\{$(R/S)-pn$\}$]$_2$[Mn$\{$(R/S)-pn$\}_2$(H$_2$O)][Cr(CN)$_6$]$_2$, which, as is shown, corresponds to the spin-soliton resonance. It has been established that this sequence corresponds to an incommensurate magnetic structure induced by the competition between the symmetric and antisymmetric exchange interactions. On the basis of the FMR spectra and their dependence on the temperature, the parameters of the modulated magnetic structure have been estimated.