Accueil > Artois teams > Thin Films & Nanomaterials | ||||||||||||||||||||||||||||||||||||
Thin Films & Nanomaterials
|
Our research centers around numerous collaborations, including the University of Southampton (England), the University of Saarland (Germany), The University “Tor Vergata” of Rome (Italy), the University of Kiev (Ukraine), the University of Sidi Bel Abbes (Algeria), the University of Barcelona (Spain), the CRISMAT-Caen, IEMN Lille, the UDSMM-Calais, the LRCS in Amiens…
Top of the page
In thin films, we have developed new metastable phases from the Ln2Ti2O7 (Ln = Sm, Eu, Gd) family with layered perovskite structure. The ferroelectric character was highlighted through PFM measurements. Through structural studies, led in collaboration with the OXIN team (P. Roussel) by high resolution X-ray diffraction, structure-properties relationships have been established. Results were modeled by ab-initio calculations (2 thesis, J. Mater Chem 2012, 22, 9806; J. Mater Chem 2012, 22, 24894; Phys Rev B 2012, 86, 125136.
|
Our team is one of the pioneering groups in the characterization of piezoelectric/ferroelectric thin films by PFM at the nanoscale level. In this spirit, studies have been carried out on islands fabricated by Ga+ focused ion-beam in both PbZr0.4Ti0.6O3 and unlead La2Ti2O7 thin-films, in collaboration with IEMN with the help of their technological platform. These measurements have led to better understanding of the matter response to radiation in order to produce functional nano-objects (J. Appl. Phys., 2009, 105, 044101; J. Appl. Phys. 2010, 108. 042008; J. Am Ceram. Soc. To be published). In addition, PFM measurements, carried out in collaboration with the CRISMAT laboratory, on [(BiFeO3)m/(SrTiO3)n]p multi-ferroic hetero-structures have shown the potential of the interfacial strains in the super-lattice for the control of the domains-orientation as well as their density. This last result is particularly interesting for applications based on engineering domains and their walls (J. Magn. Magn. Mater., 2009, 321, 1710; Appl. Phys. Lett., 2010, 96, 022902)
|
We have developed a singular module to measure electrical fatigue at the nanoscale via the tip of an atomic force microscope and without any upper electrode. This development has permitted to show that the fatigue resistance within the local electromechanical properties was larger for ferroelectric PMN-PT film deposited on an oxide electrode than for a film prepared on a metal electrode. These measurements have helped to establish the relation between the electrical film-endurance and the nature of the material used as the bottom electrode (Thin Solid Films 2011, 520, 591-596)
|
We have shown that a low concentration of ferroelectric nanoparticles in a nematic liquid crystal significantly improves the electro-optical properties of the latter (voltage switch, birefringence). Moreover, the work, carried out in the framework of the ANR P3N2009 NANODIELLIPSO, has contributed to some sensible improvement of the ellipsometry Delta Psi 2 software which was developed by Horiba scientific to measure optical properties of nanomaterials (Review of Scientific Instruments 035103 (2010), J. Appl. Phys. 074102 (2012), one thesis ongoing).
|
Top of the page
Last name, First name |
Type |
Thesis title |
Ferri Anthony |
Thesis
|
Nanoscale characterization of PMN-PT and PLZT ferroelectric thin films by piezoelectric force microscopy |
Shao ZhenMian |
Thesis
|
The new ferroelectric systems (La1-XLNX)2Ti2O7 (Ln = Pr, Nd, Sm): synthesis, structural characterization and electrical measurements on thin films and bulk |
Lecturer |
Investigation of structural and local electrical properties in Ln2Ti2O7 thin films grown by sol-gel | |
Bruyer Emilie
|
Thesis
|
Structural, electronic and ferroelectric properties in Ln2Ti2O7 systems (Ln = lanthanides) and SrTiO3/BiFeO3 heterostructures |
Lecturer |
Structural, electronic and ferroelectric properties in BiFeO3/SrTiO3 heterostructures: ab-initio study | |
Bayart Alexandre
|
Thesis
|
Growth and investigations of local electric and magnetic properties of new lanthanides-based thin films and heterostructures |
Nemer Salim
|
Post-Doc
|
Numerical simulations of the properties of magnetic materials – Application to ellipsometry |
Detalle Mikaël
|
Lecturer
|
Characterization of ferroelectric and multiferroic thin films by scanning probe microscopy |