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Piezoelectricity

Quantitative Probes for Dynamics in Multiferroic Complex Oxides Paul G. Evans, University of Wisconsin, Madison DMR 0705370. Piezoelectricity and Polarization Switching in Multiferroic Complex Oxide Devices. Piezoelectricity.

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Piezoelectricity

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  1. Quantitative Probes for Dynamics in Multiferroic Complex OxidesPaul G. Evans, University of Wisconsin, Madison DMR 0705370 Piezoelectricity and Polarization Switching in Multiferroic Complex Oxide Devices Piezoelectricity Multiferroic complex oxides have ferroelectric and magnetic properties linked with micron-scale polarization and magnetization. We have found that the piezoelectric response of a promising multiferroic material, BiFeO3, is sufficiently large at high frequencies to allow high strains to be rapidly modulated (at right). Studies with synchrotron microdiffraction also reveal the structural signatures associated with polarization switching, including a change in the intensity of Bragg reflections due to the non-centrosymmetric structure (below). These results demonstrate that the BiFeO3 can have large piezoelectric distortions that are comparable with the best piezoelectric thin film materials and set the stage for studies of the coupling of magnetism to ferroelectricity. Polarization Switching poled with +10 V poled with -10 V poled with +10 V

  2. Quantitative Probes for Dynamics in Multiferroic Complex OxidesPaul G. Evans, University of Wisconsin, Madison DMR0705370 Scientific Outreach We have participated in activities introducing science and engineering to wide audiences. In the photo, for example, graduate student Rebecca Sichel is hosting approximately 40 students during the University’s Expanding Your Horizons one-day conference. This program for middle school girls includes visits to women in technical fields at their places of work. The visitors performed experiments with Rebecca and shared her excitement about science and engineering. Research Tools for Interpreting 3D Reciprocal Space Maps Undergraduate Luke Winslow worked with the Evans research group to develop computer tools to simplify the quantitative interpretation of three-dimensional x-ray reciprocal space maps. A vast amount of data is acquired very rapidly during synchrotron x-ray diffraction studies in the form of 2D sections of the three dimensional reciprocal space (inset). Luke’s work allowed stacks of many slices to be converted to quantitative reciprocal space maps.

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