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| Title: | Interface-oxygen-loss-controlled voltage offsets in epitaxial Pb(Zr₀.₅₂Ti₀.₄₈)O₃ thin-film capacitors with La₀.₇Sr₀.₃MnO₃ electrodes | Authors: | Wu, W Wong, KH Choy, CL |
Issue Date: | 22-Nov-2004 | Source: | Applied physics letters, 22 Nov. 2004, v. 85, no. 21, p. 5013-5015 | Abstract: | Epitaxial Pb(Zr₀.₅₂Ti₀.₄₈)O₃(PZT) thin-film capacitors with La₀.₇Sr₀.₃MnO₃(LSMO) electrodes have been grown on (LaAlO₃)₀.₃(SrAl₀.₅Ta₀.₅O₃)₀.₇ (001) substrates by pulsed-laser deposition. The process-induced imprint behavior in the ferroelectric capacitors was examined by in situ and ex situ annealing at various conditions. It was found that for the capacitors in situ annealed at reduced oxygen pressures, where the LSMO electrodes are stable, voltage offsets in the polarization-electric field hysteresis loops were observed only for those treated at temperatures higher than the Curie temperature. At lower temperatures, the oxygen loss may be suppressed by stresses arising primarily from the paraelectric-to-ferroelectric transformation. However, for the capacitors ex situ annealed at the same low temperature, large voltage offsets were induced due to the oxygen instability of the LSMO electrodes. We show evidence that the imprint is caused by oxygen loss at the PZT∕LSMO interface, and closely related to the variation of the PZT structure. | Keywords: | Lead compounds Epitaxial layers Ferroelectric thin films Thin film capacitors Ferroelectric capacitors Electrodes Dielectric polarisation Dielectric hysteresis Ferroelectric Curie temperature Internal stresses Lanthanum compounds Strontium compounds Annealing |
Publisher: | American Institute of Physics | Journal: | Applied physics letters | ISSN: | 0003-6951 | EISSN: | 1077-3118 | DOI: | 10.1063/1.1827929 | Rights: | © 2004 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in W. Wu, K. H. Wong & C. L. Choy, Appl. Phys. Lett. 85, 5013 (2004) and may be found at http://apl.aip.org/resource/1/applab/v85/i21/p5013_s1 |
| Appears in Collections: | Journal/Magazine Article |
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