Combining ferroelectric with antiferromagentic materials in nanometer scale is an effective method for exploring multiferroic materials. We present two kinds of systems to show the possibility of multiferroic properties in such nanometer composites. One is the artificial superlattice La FeO3-YMnO3, and the other is the natural layered Aurivillius material Bi4Ti3O12 doped with different layers of LaFeO3, BiFeO3. Both materials were synthesized by pulsed laser deposition method on Sr Ti O3 substrates. Microst...