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Design and Functionalization of Magnetic Core-Shell Oxide Nanoparticles Exhibiting Exchange Bias Features

Published online by Cambridge University Press:  23 June 2011

Fayna Mammeri ,
Faïza Mamèche ,
Zeinab Kataya ,
Nader Yaacoub ,
Anna Slawska-Waniewska ,
Nicolas Menguy ,
Jean-Marc Grenèche  and
Souad Ammar
Fayna Mammeri
Affiliation:
ITODYS, Univ Paris-Diderot, Sorbonne Paris Cité, UMR 7086 CNRS, 15 Rue Jean-Antoine de Baïf, Paris, 75205 France.
Faïza Mamèche
Affiliation:
ITODYS, Univ Paris-Diderot, Sorbonne Paris Cité, UMR 7086 CNRS, 15 Rue Jean-Antoine de Baïf, Paris, 75205 France.
Zeinab Kataya
Affiliation:
LPEC, Univ du Maine, UMR 6087 CNRS, Avenue Olivier Messiaen, Le Mans, 72085 France
Nader Yaacoub
Affiliation:
LPEC, Univ du Maine, UMR 6087 CNRS, Avenue Olivier Messiaen, Le Mans, 72085 France
Anna Slawska-Waniewska
Affiliation:
IFPAN, al. Lotników 32/46, Warszaw, 02-668 Poland
Nicolas Menguy
Affiliation:
IMPMC, Univ Paris 6, Paris Sorbonne, UMR 7590 CNRS, 4 Place Jussieu, Paris, 75005 France
Jean-Marc Grenèche
Affiliation:
LPEC, Univ du Maine, UMR 6087 CNRS, Avenue Olivier Messiaen, Le Mans, 72085 France
Souad Ammar
Affiliation:
ITODYS, Univ Paris-Diderot, Sorbonne Paris Cité, UMR 7086 CNRS, 15 Rue Jean-Antoine de Baïf, Paris, 75205 France.
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Abstract

Core-shell magnetic nanoparticles (CSNPs) composed of a ferrimagnetic core (CoFe2O4) embedded in an antiferromagnetic shell (CoO) were produced using seed mediated growth in a polyol. Different core sizes and shell thicknesses were considered. The structural and magnetic properties of assemblies of these nanoparticles were characterized by means of X-ray Diffraction, Transmission Electron Microscopy, dc-magnetometry (SQUID) and 57Fe Mössbauer spectrometry. The measured EB magnetic field values, at low temperature, are found to be weak whatever the microstructural characteristics of the studied CSMNPs. Simultaneously, both the magnetization and the interparticle interaction (mainly dipolar) appear clearly reduced when the shell thickness increases.

Keywords

core/shellmagnetic propertiessurface chemistry
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1359: Symposium NN – Electronic Organic and Inorganic Hybrid Nanomaterials—Synthesis, Device Physics and Their Applications , 2011 , mrss11-1359-nn08-07
Copyright
Copyright © Materials Research Society 2011

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References

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