| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advances in Multiphysics Modeling and Multi-modal Imaging of Functional Materials
|
| Presentation Title |
Ultrafast X-Ray Imaging and Dynamics in Functional Complex Oxides: Nanoscale Transformations and Dynamical Modes |
| Author(s) |
Paul Evans |
| On-Site Speaker (Planned) |
Paul Evans |
| Abstract Scope |
Nanoscale magnetic and ferroelectric order in complex oxides lead to a series of dynamical phenomena with time dependence that depends on the scale of the system, often reaching as fast as the picosecond timescale. Emerging synchrotron x-ray nanobeam diffraction and ultrafast free-electron-laser techniques allow these phenomena to be imaged and probed precisely. We report a series of optically induced structural phenomena in the multiferroic complex oxide BiFeO3 that include a nanoscale rhombohedral-to-tetragonal transformation and the ultrafast development of photoinduced mechanical stress through depolarization field screening. A similar ultrafast photoinduced oscillation arises in ferroelectric/dielectric PbTiO3/SrTiO3 superlattices, in which the dynamics arise from the nanoscale periodicity of the superlattice. Further advances in diffraction techniques employing ultrafast x-ray resonant scattering promise to provide similar insight into magnetic dynamics. |