Competition of two mechanisms of retardation of domain walls in the molecular ferrimagnet [Mn$\{(R/S)-pn\}]_2$ [Mn$\{(R/S)-pn\}_2$(H$_2$O)][Cr(CN)$_6$]$_2$

The temperature dependence of the magnetization reversal dynamics of the chiral molecular ferrimagnet [Mn$\{(R/S)-pn\}]_2$ [Mn$\{(R/S)-pn\}_2$(H$_2$O)][Cr(CN)$_6$]$_2$ has been studied at low frequencies of 1–1400 Hz, which are characteristic of the domain wall motion. It has been found from the Cole-Cole plots that domain walls undergo relaxation (at temperatures $T >$ 10 K) and creep (at $T <$ 10 K), and the main parameters determining these modes and the transition between them have been determined. It has been shown that the quantitative regularities of the transition between the modes of the domain wall motion correspond to the concepts of the competition between the contributions of two mechanisms to the domain wall retardation (the periodic Peierls relief and random structural defects).