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

Growth of Co-based magnetic films by high magnetic field assisted pulsed electrodeposition – COMAGNET

Submission summary

The COMAGNET project is positionned in the following topic developed over several years by each partner laboratory (LACMDTI University of Reims Champagne-Ardenne (France) and Laboratoire EPM at Northeastern University - China): the magnétoscience. The interaction of a magnetic field with a materials elaboration process can change the characteristics of the compounds obtained. The main interest of this project is to develop magnetic films of cobalt based metal alloys or oxides, with applications in the magnetic field. Candidates for our studies are nanostructured alloys such as CoX (X = Cu, Ni, Fe, Cr, Pt ..) and oxides such as CoFe2O4 for different applications: permanent magnets, magnetic recording, magnetoresistive effect GMR giant magneto-optical. The major objective is to show that the magnetic properties (coercive force, saturation magnetization, magnetic anisotropy) are modified by the imposition of a high magnetic field (HMF) during the production process. Originality and innovative aspect of COMAGNET is to couple two processes carried out under high magnetic field:
-firstly develop alloys and oxides of nanostructured cobalt electrodeposition under pulsed magnetic field
-on the other hand, perform thermal treatments or oxidation of electrodeposited materials in the presence of magnetic field under controlled atmosphere.
The coupling of both processes is to increase the functionality of the material.
Studies of the electrodeposition (low-cost method) in a magnetic field of thin films of oxides or alloys have shown the influence of magnetic field on the morphology, crystallographic phase composition or the physical properties of the material. The magnetic field generally promotes deposits denser and more homogeneous with grain sizes reduced. The magnetic field then becomes an alternative brighteners and leveling agents during the process. In the case of deposits of cobalt or cobalt alloys such as FeCo, the magnetic field influences the structure and magnetic properties of the material. Generally, deposits made by electrodeposition require thermal treatments under controlled atmosphere to improve the functionality of the material. The EPM Laboratory has significant experience in the field of metallurgical phenomena in high magnetic fields such as solidification, diffusion, and reactions to the film-substrate interface. In this project, both thick deposits or nanometric thickness depending on the desired application could be developped.
The part of the project "electrodeposition under high magnetic field " will be coordinated by the LACMDTI and will be completed by the recruitment of two post-doctoral positions while the EPM hire a postdoc to conduct the study “treatment under HMF. The characterizations of the materials obtained will be shared by both partners, since their equipment are highly complementary (Analysis by XRD, ICP, XPS, AES, SEM, TEM, MFM, VSM ...). The formation mechanisms of various materials during processes used will be captured by fundamental studies in the third year based on the experience of the both laboratories.




Project coordination

Jean-Paul CHOPART (UNIVERSITE DE REIMS) – jp.chopart@univ-reims.fr

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

URCA UNIVERSITE DE REIMS

Help of the ANR 192,400 euros
Beginning and duration of the scientific project: - 36 Months

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