M. Guillaume Nataf

Chargé de recherche CNRS

UMR Université-CNRS 7347 - Materiaux, microéléctronique, acoustique, nanotechnologies (GREMAN)
UFR de Sciences et Techniques

Coordonnées

Parc de Grandmont 37200 TOURS

Tél: 0254552166
Mail: guillaume.nataf@univ-tours.fr

Thèmes de recherche

My research focuses on functional oxides (ferroelectrics and ferroelastics), whose outstanding properties result from a complex interaction between chemical compositions, crystallographic orientations and micro/nanostructures. I am particularly interested in micro/nanostructures (pores, domains, domain walls) and:

the evolution of their structural properties across phase transitions,
their response under constraint,
the characterisation and understanding of their own functionalities,
their role in thermal properties of materials.

Group members

Lucile Féger, PhD student (co-supervised with Isabelle Laffez)

Joachim Montoussé, PhD student (with the French company Soitec, co-supervised with Silvana Mercone, Kevin Nadaud, Micka Bah)

Vijaya Bhasker, PhD student (co-supervised with Fabien Giovannelli)

Nassima Radouane, postdoc

Previous group members

Edgar Chaslin, master student (now PhD student at University of Rennes)
Mehdi El Kamily, master student

Activités / CV

Key Publications

G. F. Nataf, M. Guennou, J. M. Gregg, D. Meier, J. Hlinka, E. K. H. Salje, J. Kreisel. Domain-wall engineering and topological defects in ferroelectric and ferroelastic materials. Nature Reviews Physics 2, 634-648 (2020) – doi: 10.1038/s42254-020-0235-z
G. F. Nataf, M. Guennou, G. Scalia, X. Moya, T. D. Wilkinson, J. P. F. Lagerwall. High-contrast imaging of 180° ferroelectric domains by optical microscopy using ferroelectric liquid crystals. Applied Physics Letters 116, 212901 (2020) – doi: 10.1063/5.0008845
G. F. Nataf, M. Guennou, J. Kreisel, P. Hicher, R. Haumont, O. Aktas, E. K. H. Salje, L. Tortech, C. Mathieu, D. Martinotti, N. Barrett. Control of surface potential at polar domain walls in a nonpolar oxide. Phys. Rev. Mater. 1, 74410 (2017) – doi: 10.1103/PhysRevMaterials.1.074410
G. F. Nataf, P. Grysan, M. Guennou, J. Kreisel, D. Martinotti, C. L. Rountree, C. Mathieu, N. Barrett. Low energy electron imaging of domains and domain walls in magnesium-doped lithium niobate. Sci. Rep. 6, 33098 (2016) – doi: 10.1038/srep33098
G. F. Nataf, P. O. Castillo-Villa, J. Baró, X. Illa, E. Vives, A. Planes, E. K. H. Salje. Avalanches in compressed porous SiO₂-based materials. Phys. Rev. E 90, 022405 (2014) – doi: 10.1103/PhysRevE.90.022405
E. K. H. Salje, M. Carpenter, G. F. Nataf, G. Picht, K. Webber, J. Weerasinghe, S. Lisenkov, L. Bellaiche. Elastic excitations in BaTiO3 single crystals and ceramics: Mobile domain boundaries and polar nanoregions observed by RUS. Phys. Rev. B 87, 014106 (2013) – doi: 10.1103/PhysRevB.87.01410

Invited talks

Domain-wall engineering in multiferroic materials. Annual meeting of the German Physical Society on Condensed Matter Physics. Regensburg, Germany, 2022.
Avalanches in ferroelectric and ferroelastic materials. Avalanche dynamics and precursors of catastrophic events. Debrecen, Hungary, 2022.
Multiferroic domain walls in ferroelastic materials. 9th International Advances in Applied Physics & Materials Science Congress & Exhibition. Ölüdeniz, Turkey, 2019.
Towards giant barocaloric materials with low hysteresis. EMN Meeting on Caloric Materials. Lyon, France, 2018.
High-pressure calorimetric methods for barocaloric materials. Short Summer School on TA&C. Chisinau, Moldavia, 2017

Research projects

ERC Starting Grant (2023-2027): Ferroic Materials for Dynamic Heat Flow Control