Magnetic behaviour of a hybrid polymer obtained from ethyl acrylate and the magnetic cluster Mn12O12(acrylate)(16)

The magnetic properties of polymers prepared by polymerization of the magnetic cluster Mn12O12(acrylate) 16 with various portions of ethyl acrylate as co-monomer are reported. According to SAXS studies, the clusters are homogeneously distributed in the polymer. Ac susceptibility measurements show superparamagnet-like behaviour of the cluster-crosslinked polymers with relaxation following an Arrhenius law with tau(0) = 4-8 x 10(-8) s and an energy barrier in the range 45-65 K.