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Retention loss phenomena in hydrothermally fabricated heteroepitaxial PbTiO3 films studied by scanning probe microscopy

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4 Author(s)
Ahn, W.S. ; Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-Dong, Yuseong-Gu, Daejeon 305-701, Republic of Korea ; Jung, W.W. ; Choi, S.K. ; Cho, Yasuo

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We observed the retention loss phenomena of the nanodomains with an average diameter of 36 nm and that of the square domains with a size of 1 and 25 μm2 that were reversed by an applying electric field at an atomic force microscopy conductive tip in a heteroepitaxial PbTiO3 thin film, which was fabricated via hydrothermal epitaxy below Curie temperature, TC. While the nanodomains did not undergo significant retention loss until 5.3×106 s, the square domains revealed some retention loss for a fixed period after long latent periods. The observed phenomena were explained in terms of the instability of the curved c/c domain wall and the compressive strain energy. Analyses showed that the nanodomains composed a cylinder extending to the bottom electrode; however, the square domains had a curved c/c domain wall, including the compressive strain energy, and these factors caused the retention loss.

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Applied Physics Letters  (Volume:88 ,  Issue: 8 )