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We have investigated the magnetotransport properties of La0.7Sr0.3MnO3/BaTiO3superlattices, grown on SrTiO3 substrate by pulsed laser deposition technique,both with current-in-plane and current-perpendicular-to-the-plane directions.Several features indicate the presence of magnetic inhomogeneities at theinterfaces which is independent of BaTiO3 layer thickness variation. First, themagnetic property in the superlattices decreases. Second, a hysteresis inmagnetoresistance due to the relaxation of the resistive state is observed.Third, a threshold under an applied magnetic field in the magnetoresistance isseen. Such behaviors are in agreement with the phase separation scenario whichcould be the possible reason for these magnetic inhomogeneities at theinterfaces. On the contrary, the magnetoresistance with thecurrent-perpendicular-to-the-plane direction is mostly attributed to thetunneling effect along with the ordering of the spin at the interface. Thisstudy confirms the importance of the interfaces in superlattices that can beused to control novel physical properties in oxide materials.Comment: 12 pages, 4 figures, to be published in Jour. Appl. Phy

The magnetotransport properties of La0.7Sr0.3MnO3∕BaTiO3 superlattices grown by pulsed laser deposition technique