Epitaxial and LSMO/PZT/LSMO heterostructures have been grown on substrates by pulsed-laser deposition. Three types of ferroelectric capacitors, i.e., Pt/PZT/LSMO (A), LSMO/PZT/LSMO (B), and Pt/PZT/LSMO (C) have been fabricated, where the Pt electrode was sputter deposited onto as-grown (capacitor A) and in situ annealed (capacitor C) PZT/LSMO films, respectively. It is found that the LSMO/PZT/LSMO capacitor shows a low coercive field and good fatigue endurance up to switching cycles. Similar properties are also obtained for capacitor A. However, the capacitor C, with the PZT film in situ annealed at reduced oxygen pressures, exhibits higher switching voltages and starts to fatigue rapidly at about bipolar switching cycles. Lead deficiency at the surface of the annealed PZT films has been observed. Our results demonstrate that the fatigue performance of PZT/LSMO films, although affected greatly by the electrode configurations, is intrinsically determined by the interface property at the top electrode.
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20 November 2000
Research Article|
November 20 2000
Top-interface-controlled fatigue of epitaxial ferroelectric thin films on electrodes
Wenbin Wu;
Wenbin Wu
Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China
Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
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K. H. Wong;
K. H. Wong
Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
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C. L. Choy;
C. L. Choy
Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
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Y. H. Zhang
Y. H. Zhang
Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China
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Appl. Phys. Lett. 77, 3441–3443 (2000)
Article history
Received:
May 30 2000
Accepted:
September 20 2000
Citation
Wenbin Wu, K. H. Wong, C. L. Choy, Y. H. Zhang; Top-interface-controlled fatigue of epitaxial ferroelectric thin films on electrodes. Appl. Phys. Lett. 20 November 2000; 77 (21): 3441–3443. https://doi.org/10.1063/1.1327279
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