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Artificial superlattices designed with ferromagnetic Pr0.85Ca0.15MnO3insulating layer and ferroelectric Ba0.6Sr0.4TiO3 layer were grown on (100)SrTiO3 substrates. The magnetotransport properties were measured with thecurrent perpendicular to the plane geometry. An increase in magnetoresistance(MR), with no significant low field effect, was observed as the number offerroelectric Ba0.6Sr0.4TiO3 layer thickness increases even up to 9 unit cells.For example, the superlattice [(Pr0.85Ca0.15MnO3)10(Ba0.6Sr0.4TiO3)9]25 shows35 % MR at 100 K, though the Pr0.85Ca0.15MnO3 film was a robust insulator withnegligible MR even at high applied magnetic field. This observed large MRcannot be explained by simple interfacial ferromagnetism or by the tunnelingmagnetoresistance. One possible explanation could be the effect due to theferroelectric spacer layer and the associated magnetoelectric coupling.Comment: To be published in Appl. Phys. Let

Enhanced magnetoresistance in ferromagnetic Pr0.85Ca0.15MnO3∕ferroelectric Ba0.6Sr0.4TiO3 superlattice films