  Dimethylammonium magnesium formate, [(CH$_3$)$_2$NH$_2$][Mg(HCOO)$_3$] or
DMAMgF, is a model to study high temperature hybrid perovskite-like
dielectrics. This compound displays a phase transition from para to
ferroelectric at about 260~K. Using multifrequency electron spin resonance in
continuous wave and pulsed modes, we herein present the quantum dynamic of
Mn$^{2+}$ ion probe in DMAMgF. In the high temperature paraelectric phase, we
observe a large distribution of the zero field splitting that is attributed to
high local disorder and further supported by DFT computations. In the low
temperature ferroelectric phase, a single structure phase is detected and shown
to contain two magnetic structures. The complex EPR signals were identifed by
the means of Rabi oscillation method combined to crystal fields kernel density
estimation.
