Blanc Inter SIMI 9 - Blanc international - Sciences de l'information, de la matière et de l'ingénierie : Sciences de l'ingénierie, matériaux, procédés, énergie

Microwave dedicated nanostructured ferrite ceramics: from basic research to integrated devices. – MINAFC

Submission summary

MINAFC is a bilateral technological project supported by 5 partners involved in the preparation of magnetic nanopowders (nanoparticles and nansotrutcured particles), their consolidation as nansotructured ceramics using Spark Plasma Sintering (SPS) technology, their characterization and the study of their magnetic properties with a special emphasis on their microwave behavior. The main aims of this project are to perform basic research in order to understand the magnetic properties of nanocrystalline materials and to tentatively transfer this general knowledge to the fabrication of new and more efficient microwave devices. Ferrite materials are choosen as model materials. Due to their tuned magnetic properties in relation with their large variety of structures (spinel, hexaferrite, garnet) and their rich chemical compositions, they were widely used in recording systems for magnetic storage, high frequency inductors, microwave absorbers, radar systems, phase array antennas, and in virtually all communications systems. Spinel and garnet ferrites can be applied in the high-frequency region of several hundred MHz to several GHz and hexaferrites can be applied in the whole GHz region. If the technical opportunities, opened by the nanometer scale, become possible through the success in the consolidation of ferrite nanoparticles as nanostructured ceramics, a new limit in microwave technology will be crossed and real advances can be performed in the information and communication technology.
The present French and Mexican consortium offers real opportunities for the achievements of this goals: Two groups of chemists, ITODYS lab. from Université Paris Diderot, who developed the chimie douce nanoparticles synthesis method, (Partner 1) and the AAM lab. from Universidad Autonoma del Estado de Hidalgo, who has an expertise in the preparation of nanoparticles by mechanosynthesis (Partner 5) ; Two groups with expertise in the study and applications of magnetic materials, SATIE lab. from Ecole Nationale Supérieure de Cachan (Partner 3), and IRM Instituto de Investigaciones en Materiales from Universidad Nacional Autonoma de Mexico (Partner 4) and a group with expertise in the analysis of magnetic structures by Mossbauer Spectroscopy and their theoretical study, LPEC lab. from Université du Maine Le Mans (Partner 2).
It is important to note that general properties of nanosized particles can be extremely different from those of bulk, essentially because the surface of nanoparticles (or interfaces of nanocrystals) becomes quite significant as compared with the total particle core or grain. The surface or interface has many defects and irregular bonding, and this is the main reason for the current interest in nanostructured materials. In the case of magnetic nanoparticles, magnetic interactions between nanoparticles (which depends in a complex way of average distances, dipolar fields, the possibility to form clusters, etc.), leading to macroscopic magnetic properties completely different. This is an important issue that will be investigated, since it is at the basis of many technological applications (high-density magnetic recording, microwave response, etc.).
Obtaining high-density consolidated samples keeping the nanosized grains, in order to preserve the magnetic properties, is also a great challenge. SPS technology is a promising technique, as shown by preliminary results already obtained by a previous collaboration between partners 1 (France) and 4 (Mexico). In SPS, sintering times and temperatures are strongly reduced by the application of a high pressure and high electric current pulses. Finally, experimental and theoretical studies of the magnetic properties as a consequence of the nanostructured microstructure of these ceramics will be attempted and all the collected data, especially the high-frequency (microwave) related ones, will be discussed in order to develop some pertinent technological applications

Project coordination

ammar-merah souad (CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DELEGATION REGIONALE ILE-DE-FRANCE SECTEUR EST) – ammarmer@univ-paris-diderot.it

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

ITODYS CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DELEGATION REGIONALE ILE-DE-FRANCE SECTEUR EST
LPEC CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DELEGATION REGIONALE BRETAGNE ET PAYS- DE-LA-LOIRE
SATIE CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DELEGATION REGIONALE ILE-DE-FRANCE SECTEUR EST

Help of the ANR 286,700 euros
Beginning and duration of the scientific project: - 36 Months

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