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Materials Science at Oregon State University

Stabilisation of multifunctional artificial superlattices - PLEASE NOTE: Seminar in Gilbert 324 at 4:00 pm

Date: Monday, Apr 13th
Presenter: Dr. Wilfred Prellier, Laboratoire CRISMAT, CNRS UMR 6508, ENSICAEN

Abstract


Artificial superlattices provide excellent opportunities to manipulate the strain and chemical heterogeneity in order to exhibit completely new or enhance the properties, which were absent in the parent compounds. It is also possible to overcome the natural preference for disorder or low-dimensional ordering in certain materials by controlling the location of cations. Consequently, there has been recently growing interest in tailoring materials having original properties that can not be obtained in the form of bulk materials using the process of the pulsed laser deposition technique.
In this talk, I will exemplify how one can utilize the present approach in designing materials under very peculiar conditions. Two examples will be taken to illustrate this study. In first one, we will show how to control the insulator-to-metal transition in La-Sr-V-O system, while in the second, we will present how to improve some properties of multiferroic BiFeO3 materials. The structural (X-ray diffraction, transmission electron microscopy), transport properties (resistive, capacitance) and magnetic properties have been examined. At the end, the role of the aforementioned technology in designing novel and scarce materials that can be used for nanotechnology.
This work has been carried out in the frame of the European NoE FAME and the STREP MACOMUFI (NMP3-CT-2006-032221) and COMEPHS (NMP4-CT-2005-517039). Partial support of the Ministere des Affaires Etrangeres through the Merlion project (n°2.04.07) and the CEFIPRA program (3908-1) is also acknowledged.