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Nanoscale Ferroelectric and Piezoelectric Phenomena in Oxide Heterostructures

Nanoscale Ferroelectric and Piezoelectric Phenomena in Oxide Heterostructures NSF-Europe Collaborative Program, DMR - 0427815 C.L. Jia 1 , V. Nagarajan 2 , K. Urban 1 , R. Waser 1 and R. Ramesh 3 1 IWE Juelich, Germany; 2 UNSW, Australia and 3 University of California, Berkeley.

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Nanoscale Ferroelectric and Piezoelectric Phenomena in Oxide Heterostructures

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  1. Nanoscale Ferroelectric and Piezoelectric Phenomena in Oxide Heterostructures NSF-Europe Collaborative Program, DMR - 0427815 C.L. Jia1, V. Nagarajan2, K. Urban1, R. Waser1 and R. Ramesh3 1IWE Juelich, Germany;2UNSW, Australia and 3University of California, Berkeley In this international collaboration, we are exploring approaches to directly measure the displacements of the cations in the ferroelectric phase of the PZT system in order to probe the order parameter directly. In 7nm thick films which show a strong enhancement of the overall tetragonality, we observe that the Ti/Zr ion displacement is actually smaller than that in the bulk ( by about 50%). This suppression is consistent with macroscopic electrical measurements which also show ~50% suppression in switched polarization. This work reveals for the first time, the dramatic differences between the macroscopic measurements and microscopic observations.

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