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PFM Study of the 90° Step-by-Step Domain Switching and the Temperature Effect in 0.8PbTiO3-0.2Bi(Mg0.5Ti0.5)O3 Ferroelectric Thin Film |
Dongyu HE(),Yuxin LIU |
National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China |
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Cite this article:
Dongyu HE,Yuxin LIU. PFM Study of the 90° Step-by-Step Domain Switching and the Temperature Effect in 0.8PbTiO3-0.2Bi(Mg0.5Ti0.5)O3 Ferroelectric Thin Film. Acta Metall Sin, 2019, 55(3): 325-331.
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Abstract In ferroelectrics, the presence of domain structures and switchable polarization plays an important role in ferroelectric performance and the design of future electronic devices. Understanding domain behaviors is crucial for ferroelectrics promising applications, particularly in nonvolatile memory, microwave ceramics, electromechanical sensors and actuators. As a convenient, nondestructive and high-resolution technique, the piezoresponse force microscopy (PFM) provides a powerful method for observing domain structures and their dynamic behavior at the micron and nanometer scales. In this work, PFM has been used to study the domain structures and their dynamic behavior of 0.8PbTiO3-0.2Bi(Mg0.5Ti0.5)O3 thin film. Both the a domain and the c domain coexist in the ferroelectric thin film nanometer grains. Under the tip-bias-induced electric field, the domain switching follows the two 90° steps of 180° domain switching, showing the domain polarization change from c to a to c. A remarkable effect of temperature on the domain configurations and domain dynamic response in 0.8PbTiO3-0.2Bi(Mg0.5Ti0.5)O3 thin film was found by PFM. Under the tip bias voltage of 5 V, domain evolution was more rapid with a higher temperature at 70 ℃. The surface charge is related with c domain polarization. At high temperature, the surface charge induced effective electric filed increases, allowing for the easier domain motion.
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Received: 21 March 2018
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