CE09 - Nanomatériaux et nanotechnologies pour les produits du futur

MOlecular approach of NAnostructured multiFERroics – MONAFER

Submission summary

Multiferroics are multifunctional materials that have acquired this denomination in 1994 at the moment of the revival of their studies. Since then more than 10,000 articles have been published on all the aspects of this interdisciplinary topics. The interest for these materials that combine (anti-)ferromagnetism, ferroelectricity and/or ferroelasticity is related to their high potential applications in spintronics, a domain of electronics that exploits both the charge and the spin of the electrons. In order to fully exploit these possibilities, one has to propose solutions to several challenges, the central ones being the coupling of the ferroelectric and magnetic properties, the increase of the ordering temperature and the integration of these materials into electronics devices.
Up to now, the multiferroics that appear in the literature are almost exclusively oxides. Rare molecular multiferroic materials were described and no example of nanostructured molecular multiferroics was published. Nonetheless, using molecular precursors to build up multiferroics sounds like a promising idea for at least two reasons. First, the coexistence of ferromagnetism and ferroelectricity within the same oxide has been proven to be problematic. Second, the non-centrosymmetry and charge separation needed for ferroelectricity are often more easily achieved in molecular compounds. The main drawbacks of the metal-organic framework (MOF) that were used to obtain multiferroics is their low long-range magnetic ordering temperature and the difficulty to make electrical contacts to precisely determine their ferroelectric properties. Moreover, most of the published molecule-based multiferroics were obtained by spontaneous resolution starting from achiral or racemic precursors. This project intends to propose solutions to these drawbacks.
In this project, our main synthetic goal is to develop a family of enantiopure chiral Prussian Blue Analogs by introducing resolved chiral coligands. The enantiopurity of the material will insure that its non-centrosymmetry related to its structural chirality and shall lead to a macroscopic electric polarisation, whereas the cyanide bridge is the most promising to increase the ferromagnetic Curie Temperature. In parallel, a processing method based on the deposition of molecular materials into nanoporous alumina membranes will be developed. The alumina matrix will insure a chemical and mechanical protection of the molecular materials as well as a neat organisation of the nanowires. A complete investigation of these chiral materials both in their bulk and nanostructured forms will be undertaken as a function of temperature, electric and magnetic fields, in order to establish their structural, magnetic, dielectric and magnetoelectric behaviors. It will rely on standard and original macroscopic techniques like magneto-chiral dichroism as well as microscopic probing methods like inelastic neutrons scattering.

Project coordination

Cyril Train (LABORATOIRE NATIONAL DES CHAMPS MAGNETIQUES INTENSES)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

LNCMI LABORATOIRE NATIONAL DES CHAMPS MAGNETIQUES INTENSES
INEEL Institut Néel - CNRS

Help of the ANR 389,880 euros
Beginning and duration of the scientific project: December 2018 - 48 Months

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