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000052676 0247_ $$2DOI$$a10.1063/1.2337357
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000052676 084__ $$2WoS$$aPhysics, Applied
000052676 1001_ $$0P:(DE-Juel1)VDB50077$$aWatanabe, T.$$b0$$uFZJ
000052676 245__ $$aControlled crystal growth of layered-perovskite thin films as an approach to study their basic properties
000052676 260__ $$aMelville, NY$$bAmerican Institute of Physics$$c2006
000052676 300__ $$a051602
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000052676 440_0 $$03051$$aJournal of Applied Physics$$v100$$x0021-8979$$y5
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000052676 520__ $$aThis article describes the current progress in thin bismuth layer-structured ferroelectric films (BLSFs) including SrBi2Ta2O9 and (Bi,La)(4)Ti3O12, particularly those developed in the last ten years. BLSF thin films can be applied to ferroelectric random access memories because of their durable fatigue-free properties and lead-free composition. We will briefly introduce epitaxial thin films grown on a variety of substrates. Because of the difficulty in growing single crystals of sufficient size to characterize the ferroelectric behavior in specific crystal growth directions, we will characterize epitaxially grown thin films to obtain basic information about the anisotropic switching behavior, which is important for evaluating the performance of emerging materials. We will then discuss the fiber-textured growth on the (111)Pt-covered Si substrates of SrBi2Ta2O9 and Bi4Ti3O12 thin films. Because we expect that the spread crystal orientation will affect the bit-to-bit errors, we believe that the fiber-textured growth and the characterization technique for the deposited film orientation are interesting from a practical standpoint. Another specific challenge of thin film growth is the growth of a-axis-(polar axis)-oriented films. a-/b-axis-oriented films are characterized both crystallographically and by electric hysteresis loop. The hysteresis performance was in accordance with the volume fraction of the a/b domains; however, no evidence for 90 degrees switching of the b domain by an external electric field was obtained. The control of film orientation also allows systematic studies on the effects of a structural modification and relation between spontaneous polarization and Curie temperature, examples of which are given in this paper. After a short description of the piezoelectric properties, we will conclude with a summary and the future prospects of BLSF thin films for research and applications. (c) 2006 American Institute of Physics.
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000052676 7001_ $$0P:(DE-HGF)0$$aFunakubo, H.$$b1
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000052676 8567_ $$uhttp://hdl.handle.net/2128/1029$$uhttp://dx.doi.org/10.1063/1.2337357
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