Facile synthesis of shell-core polyaniline/SrFe12O19 composites and magnetic properties

Polyaniline (PANI)/SrFe12O19 (SrM) composites were synthesized by in situ polymerization and characterized by XRD, FT-IR, SEM, TEM and VSM. The results showed that SrFe12O19 particles obtained by a hydrothermal method were of uniform hexagonal plate-like structures with diameters ranging from 2-5 mu m. PANI/SrM composites with 15 wt% PANI displayed a shell-core structure. The SrFe12O19 particles were embedded in PANI. Magnetic property results showed that, due to the presence of a nonmagnetic PANI layer, the values of M-s, M-r, H-c were all lower than those of the pure SrFe12O19 particle, and indicated the information of a shell-core structure composite.