Mechanics of Functional Thin Film

The research activities of the Mechanics of Functional Thin Films (MFMF) team revolve around two main pillars: (i) the fabrication of thin films (primarily metallic) and nanostructures, and (ii) the in-depth study of their mechanical and functional properties, notably using multi-scale characterization techniques ranging from the micrometer (µm) to the nanometer (nm) scale.

 The researchers of the MFMF team focus on establishing the relationships between the composition and microstructure of the thin films and nanostructures—resulting from various synthesis techniques and nanostructuring strategies as well as from subsequent treatments (e.g. annealing) —and their mechanical and functional behavior. This research is based on a methodology that combines experimental work (fabrication and mechanical-functional-structural characterization of thin films) with numerical simulations.

 The thin film fabrication strategy relies on vapor phase deposition (PVD) techniques, with a focus on original approaches aimed at creating new microstructures (e.g., nanolaminates with a high density of interfaces, amorphous/crystalline or nanogranular multilayers). The goal is to improve the mechanical performance (high elastic limit and plasticity, strong resistance to cracking) or to combine high mechanical performance with functional properties.

 In parallel, the MFMF team is developing a unique experimental approach based on multi-scale characterization, particularly using in situ techniques. This approach enables the extraction of the full mechanical behavior of thin films (thickness < 1 µm), including elasticity, plasticity, fracture, adhesion, and deformation mechanisms, as well as their functional properties (optical, electrical, and magnetic). It also allows the study of the coupling between mechanical and functional properties, and the assessment of the behavior of thin films under extreme conditions (high temperature, hydrogen exposure).

 By leveraging these two pillars – fabrication and mechanical/functional characterization – the MFMF team develop new thin films and nanostructures with outstanding mechanical and functional performance.