Structural and Electrical Properties of Barium Strontium Titanate Thin Film on Conductive La1_xSrxMnO3 Bottom Layer

摘要

@@ Ferroelectrics and colossal magnetoresistance heterostructure Bal-xSrx TiO3 (BST)/La1- xSrx MnO3 (LSMO) have been fabricated on a LaAlO3 substrate by the pulse laser deposition method. The dielectric measurements show that at room temperature and 100kHz, 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 k V/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 100kV/cm at room temperature.