The tuning of quantum magnetization for organic/inorganic hybrid materials composed of Mn12-acetate and azobenzene casted into PMMA films on PVA films

In order to examine the effects of polymer matrix substituting crystalline solvents and photoisomerization of azobenzene in photo-modulation of AC susceptibility discovered recently, we have compared various quantum magnetic properties of new organic/inorganic hybrid materials composed of Mn12-acetate (a typical single-molecule magnet, [Mn12(CH3COO)16(H2O)4O12]·2CH3COOH·4H2O) containing or not containing azobenzene casted into polymethylmethacrylate (PMMA) films on Polyvinylalchol (PVA) films. The M–H hysteresis loops below blocking temperature for both materials exhibited distinct differences of the dM/dH vs. H plots, which suggested azobenzene as well as crystalline solvents resulted in tuning of magnetic properties. Moreover, the AC susceptibility at 0.1–1000 Hz frequencies provided activation energy Ueff=87 K from Arrhenius law for both materials, albeit Cole–Cole plots indicated perturbation of quantum magnetization for both hybrid materials in polymer matrix.