Influence of zeolite water on paramagnetic and ferromagnetic resonances in the Co$_2$[Nb(CN)$_8$] $\cdot$ 8H$_2$O molecular magnet

The contributions of Co$^{2+}$ and Nb$^{4+}$ ions to the high-frequency dynamic magnetic susceptibility of the Co$_2$[Nb(CN)$_8$] $\cdot$ 8H$_2$O molecular magnet in the paramagnetic state at $T >$ 12 K are separated. It is found that the ferromagnetic ordering, which leads to the reconstruction of the electron paramagnetic resonance spectrum into the ferromagnetic resonance spectrum, occurs at $T <$ 12 K. The influence of zeolite water on the spectra of the paramagnetic and ferromagnetic resonances is found. Dehydration leads to a decrease in the time of the spin relaxation of the ferromagnetic system from 50 ps to 17 ps at $T$ = 4 K and to the variation in the temperature dependences of the widths of the lines and g factors in the electron spin resonance spectra.