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Self-assembly and Interface Structure Evolution in Perovskite Oxide Epitaxial Thin Films - Efstathios Stathis I. Meletis, University of Texas at Arlington, Arlington, TX
Friday, Apr 18, 2014
10:45 a.m. - 12 p.m. Location: RL 3.204

Perovskite oxides belong to an important class of materials exhibiting excellent dielectric, ferroelectric, and piezoelectric properties. Furthermore, their thin film form exhibits enhance properties compared to their bulk counterpart and are highly desirable for advanced device applications. Several years ago, we first observed self-assembly of epitaxial La1-xSrxMnO3 into ordered nanoscale structures. Since then, we were able to achieve self-assembly in a wide variety of epitaxial perovskite-type oxides that can expand their field of applications into novel nanodevices. More recently, we have shown that the physical properties of such epitaxial oxides are strongly affected by their microstructure and interface structure and can be grown into a variety of architectures.  An overview will be presented of recent developments in BaTiO3-based epitaxial thin films and their microstructures and interface structures. The presentation will focus on (i) the effect of substrate surface structure (steps, terraces and kinks) on the microstructure of epitaxial (Ba,Sr)TiO3 films grown on miscut MgO substrates and their effect on physical properties; (ii) recent developments in understanding the interface structure of epitaxial thin films in a 2-D space using plan-view TEM; (iii) growth of nanofinger structures in Ba(Zr,Ti)O3-based epitaxial thin films formed via twin-coupling by sharing their {111}/{110} planes with respect to the epitaxial layer and the structure evolution mechanism from the epilayer to nanofingers; and (iv) development of interface regulated [Ba(Zr,Ti)O3]//(Ba,Sr)TiO3] multilayered films to achieve new properties that are not available in the individual film components.

Professor Meletis received his undergraduate degree in Chemical Engineering from the National Technical University of Athens, Greece and his M.Sc. and Ph.D. in Materials Science & Engineering (MSE) from Georgia Institute of Technology. He held appointments at Georgia Tech, IIT Research Institute, University of California, Davis and Louisiana State University where he was an Endowed Professor. He is currently Professor and Chair of MSE at The University of Texas, Arlington. His major research contributions are in the areas of surface engineering, multifunctional thin films, small-scale materials and material-environment interactions. He has more than 300 publications and a large number of plenary, keynote and invited talks. His recent work focuses on multifunctional nanocomposite thin films, scale effects on material properties, self-assembling in inorganic materials and nanofabrication. His research program has attracted more than $15M and has been funded by NSF, NASA, ARO, DARPA, Lockheed Martin and other federal and industrial sources. Dr. Meletis has been a recipient of the William Fulbright Scholar Award and is the Editor-in-Chief of the Journal of Nano Research and Quantum Matters.

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