Building enhanced ferroelectric materials through artificial layering
Location: EB1 Room 1011
Friday, January 17th 2014 - 11:00 am
One approach to developing the functional materials of the future is to build them up layer by layer using deposition techniques that allow control of thickness on the scale of angstroms. In my laboratory, we use this approach to design artificial superlattice structures based on ferroelectric perovskite oxides in which the competing behaviors of the parent materials we use interact in just the right way to produce new or enhanced functional responses. Comprehensive experiments in our laboratory and at synchrotron x-ray facilities then close the loop between structure and functional properties. Within a relatively small class of parent materials we have demonstrated that this approach can be used to engineer quite different behaviors, from improper ferroelectricity, to polarization rotation, to self poled ferroelectrics with anisotropic transport. We also use these layered ferroelectric materials as finely tuned substrates for field effect devices based on graphene. When we build materials layer by layer the whole can truly be greater than the sum of the parts.