Magnetic investigation of zero-field-cooled dextran-coated magnetite-based magnetic fluid

In this study, we investigate the temperature dependence of the zero-field-cooled magnetization of a quasi-monodisperse dextran-coated magnetite-based magnetic fluid. The well-defined maximum in the magnetization versus temperature curve and its downshift with the applied external field is explained...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2005-03, Vol.289, p.174-176
Main Authors: Morais, P.C., Santos, J.G., Silveira, L.B., Nunes, W.C., Sinnecker, J.P., Novak, M.A.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Fine-particle system
Magnetic fluid
Magnetic liquids
Magnetic properties and materials
Magnetization
Physics
Small particles and nanoscale materials
Studies of specific magnetic materials
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Summary:In this study, we investigate the temperature dependence of the zero-field-cooled magnetization of a quasi-monodisperse dextran-coated magnetite-based magnetic fluid. The well-defined maximum in the magnetization versus temperature curve and its downshift with the applied external field is explained by a simple model considering thermally activated dynamics of the nanoparticles magnetic moment and the temperature dependence of the saturation magnetization.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2004.11.051