Direct and Converse Piezoelectric Responses at the Nanoscale from Epitaxial BiFeO3 Thin Films Grown by Polymer Assisted Deposition
We use an original water-based chemical method, to grow pure epitaxial BiFeO3 (BFO) ultra-thin films with excellent piezoelectric properties. Particularly, we show that this novel chemical route produces a higher natural ferroelectric domain size distribution and coercive field compared to similar BFO films grown by physical methods. Moreover, we measured the d33 piezoelectric coefficient of 60 nm thick BFO films with a direct approach, using Direct Piezoelectric Force Microscopy (DPFM). As a result, first piezo-generated charge maps of a very thin BFO layer were obtained applying this novel technology. We also performed a comparative study of the d33 coefficients between standard PFM analysis and the DPFM microscopy showing similar values i.e. 17 pm/V and 22 pC/N respectively. Finally, we proved that the directionality of the piezoelectric effect in BFO ferroelectric thin films is preserved at low thickness dimensions demonstrating the potential of chemical processes for the development of low cost functional ferroelectric and piezoelectric devices.
Time: 11 am
Venue: Sala de Graus, Facultat de Ciències, UAB
On Thursday 11 October 2018, the programme “Els Matins de TV3”, directed by Lídia Heredia, interviewed researcher Teresa Puig about the superconducting materials, in their section devoted to science, and presented by Daniel Arbós. The section, of more than 18 minutes long, explains what superconducting materials are, what are their main applications, and shows the levitation experiment.
Enjoy the view!
Dr. Bernat Mundet defended his PhD thesis on “Atomic-scale characterization of structural distortions in perovskite oxide thin films”Monday, 9 October 2018, with great success, surrounded by his friends, family and colleagues! Congratulations!
