Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8157624 | Journal of Magnetism and Magnetic Materials | 2014 | 4 Pages |
Abstract
Nanopowders of CoFe2O4 with an average particle size of 72.7Â nm were produced by an oxidation process and they were used to obtain core-shell nanoparticles of CoFe2O4/CoFe2 by reducing them under hydrogen atmospheres. Hysteresis loops were measured from 10 to 300Â K by field-cooling the sample under an applied magnetic field of 12Â kOe. The exchange coupling among the core-shell structure was found to vary with the thickness of the shell. A phenomenological model which takes into account the thickness of a disordered layer at the core-shell surface was used for determining the exchange-bias anisotropy constant KEB (=0.22Â erg/cm2).
Related Topics
Physical Sciences and Engineering
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Condensed Matter Physics
Authors
J.M. Soares, V.B. Galdino, F.L.A. Machado,