Structural and Electrical Properties of Barium Strontium Titanate Thin Film on Conductive La1−xSrxMnO3 Bottom Layer

Ferroelectrics and colossal magnetoresistance heterostructure Ba1−xSrxTiO3(BST)/La1−xSrxMnO3 (LSMO) have been fabricated on a LaAlO3 substrate by the pulse laser deposition method. The dielectric measurements show that at room temperature and 100 kHz, the dielectric constant and loss tangent are about 990 and 0.012, respectively; the highest tunability is about 45% near 200 K under the applied electric field of 200 kV/cm. Further study indicates that the leakage current for the BST/LSMO heterostructure obeys the Schottky emission mechanism in the electric field region higher than 100 kV/cm at room temperature.