MSE Seminar - Dr. Ho Nyung Lee, Oak Ridge National Laboratory

Friday, April 4, 2008
1:00 p.m.
Rm. 2108, Chemical and Nuclear Engineering Bldg.
Annette Mateus
301 405 5207
amateus@umd.edu

"Atomic-Scale Complex Oxides Heterostructures Designed By Pulsed Laser Deposition"

Atomic-scale synthesis of complex-oxide thin films and heterostructures provides a new materials challenge to investigate the previously-unavailable phase space region. As we recently demonstrated that oxide heterostructures with hundreds of individual building blocks (single unit cell thick) of dielectric and ferroelectric titanates could be artificially grown, yielding superlattices with atomically abrupt interfaces and enhanced polar properties. The growth of such artificial oxide heterostructures, however, was a formidable task and it turned out that both the use of atomically-flat substrates and the precise control of individual layers were essential for growing heterostructures with compositionally sharp and well defined interfaces. In this seminar, I will present how we succeeded in growing almost perfect oxide heterostructures with desired properties by pulsed laser deposition. A few examples of artificial atomic-scale complex oxide heterostructures composed of ferroelectrics, ferromagnetics, and/or insulators with interesting new or enhanced physical properties such as strain-enhanced ferroelectric polarization, anomalous Hall effect, and electronic reconstruction at the interfaces of two insulating materials will be discussed.

For more information, contact Annette Mateus at (301) 405-5207 or amateus@umd.edu.

Audience: Public 

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