Abstract
Asymmetric properties of Pb(Zr,Ti)O 3 (PZT) thin films has been studied in (La,Sr)CoO 3 /Pb(Zr, Ti)O 3 /(La, Sr)CoO 3 (LSCO) heterostructures in which the conducting oxide (La,Sr)CoO 3 (LSCO) and/or LaCoO 3 (LCO) have been used as an electrode. LCO/PZT/LSCO showed a largely asymmetric P-V hysteresis loop and large relaxation of the remanent polarization at the negatively poled state, eventually leading to an imprint failure. Corresponding to P-V hysteresis loop, leakage current behavior and capacitance - voltage characteristic of the LCO/PZT/LSCO were asymmetric. Post annealing treatment at reducing atmosphere further increased the relaxation of the unstable remanenet polarization.
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