This article presents the achievement of a magnetic composite having a vinylic polymeric structure as matrix based on a styrene/methyl methacrylate/2,3-epoxypropyl methacrylate. The synthesis of the copolymers performed through an emulsion polymerization process was realized in the presence of potassium persulfate as radical initiator and sodium lauryl sulfate as anionic tensioactive agent. To have a network capable for a better coupling of the ferrite, the vinylic polymeric structure was crosslinked with a diamino-compound. The magnetic composite obtainment was confirmed by the IR, DSC, and thermogravimetric analysis, as well as by optic and electronic microscopy, and also by the determination of the magnetic susceptibility of the products. (C) 2008 Wiley Periodicals, Inc.