Composite piézo-magnétique par frittage sous champ
(Projet-ANR-22-CE09-0023)

Octobre 2022 - Septembre 2026

Partenaire IMN du projet : Philippe MOREAU  (équipe ST2E)

Coordinateur :
Laboratoire des Sciences des Procédés et des Matériaux (LSPM Villetaneuse)
Partenaires :
GREMAN Université de Tours
Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux (IPREM Pau)

Personnels IMN impliqués :
Nicolas GAUTIER (IE CNRS), Eric GAUTRON (IR CNRS), Amina MERABET (CDD IE CNRS)

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Our project concerns the development of a composite material which, thanks to its innovative chemical composition and structuring, will offer new functions enabling these magnetic characteristics to be modulated by an electric field. The aim is to shape composites whose matrix is made up of an inorganic piezoelectric phase and whose inclusions are based on acicular ferromagnetic nano-objects. The use of lead-free piezoelectric compounds and rare-earth-free magnets will be proactive in relation to current regulations. A new, economical and environmentally-friendly production process will be developed. One of the project's original features will be to combine Spark Plasma Sintering with the presence of a magnetic field to shape the composites. This sintering process will enable the magnetic phase to be organized within the piezoelectric phase, optimizing its magnetic-electric coupling properties. These properties will be studied in relation to the interface micro- and nanostructure.

The main innovative objectives of the COMPAGNON project are :

- The development of an innovative composite with coupled functions enabling the permanent magnet characteristics (Mr, Ms, Hc and Ka) to be modulated by an electric field, and with coupling coefficients of the order of hundreds of mV.cm-1.Oe-1.
- Characterization of interfaces in composites using advanced multi-scale techniques: atomic (high-resolution TEM, EELS, etc.), nanostructural (FIB-3D) and composite (XPS, PDF, etc.).
- Contribute to understanding the link between structure-composition-interface within nanocomposites (nanowires-matrix) and the ME properties obtained.
- Overcome fundamental challenges (nucleation and growth of nanowires, development of core@shell systems, magneto-electric coupling, control of grain size, interfaces and densification/structuring of composites......) and technological challenges (field nanostructuring) in the field of multifunctional materials.
- Permanent magnets with a magnetic field of the order of 1 T, without rare earths, whose intensity can be controlled by an electric field.