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Artificial superlattices of (BiFeO3)m(SrTiO3)m (m= 1 to 10 unit cells)consisting of multiferroic BiFeO3 and insulating SrTiO3 layers were fabricatedon (100)-oriented SrTiO3 substrates by pulsed laser ablation. The remnantpolarization and leakage current behavior were studied varying the periodicity(8-80A) of the superlattice. The leakage current was reduced by few orders ofmagnitude on increase of periodicity compared to single layer BiFeO3 thinfilms. Reduced leakage and intrinsic polarization hysteresis was observed andwas confirmed by PUND analysis for periodicities in the range 20-60A. Theleakage current was observed to be dominated by space charge limited conduction

Periodicity-dependence of the ferroelectric properties in BiFeO3/SrTiO3 multiferroic superlattices