Competition of Peierls relief and structural defects in the damping of domain walls in [Mn{(R/S)-pn}]2[Mn{(R/S)-pn}2(H2O)][Cr(CN)6]2 ferrimagnet

Abstract

A reverse ordering of changes in the modes of domain wall movement in the molecular ferrimagnet [Mn{(R/S)-pn}]2[Mn{(R/S)-pn}2(H2O)][Cr(CN)6]2 is observed with rising temperature in ac magnetic fields with frequencies of 0.04–1400 Hz. The appearance of a relaxation mode against the background of domain wall creep during heating of the crystals indicates that these modes apply to two different types of barriers. The existence of a threshold amplitude for the ac magnetic field confirms that the periodic Peierls relief contributes to the damping of domain walls along with the traditional contribution from pinning of the walls on structural defects.