Transitions between quantum states of the spin-soliton structure in molecular magnets [Mn$\{(R/S)-pn\}]_2$ [Mn$\{(R/S)-pn\}_2$ (H$_2$O)][Cr(CN)$_6$]$_2$

A series of jumps of the magnetic moment (up to five jumps) with an amplitude of 1–10% of the saturation magnetization has been observed upon demagnetizing the molecular magnet [Mn$\{(R/S)-pn\}]_2$ [Mn$\{(R/S)-pn\}_2$ (H$_2$O)][Cr(CN)$_6$]$_2$ in a narrow region of magnetic fields close to the coercive force. A decrease in the temperature leads to an increase in the critical magnetic field, which corresponds to the onset of the series of demagnetization jumps. The obtained experimental data agree with theoretical predictions on jump-like transitions between the magnetization curves upon attaining critical magnetic fields caused by the energy quantization of spin solitons.