Experimental evidence of surface effects in the magnetic dynamics behavior of ferrite nanoparticles

The magnetic dynamics behavior of copper and nickel ferrite nanoparticles used in the magnetic fluid elaboration and with mean sizes between 3.5 to 10.4 nm is investigated by measurements of magnetic hysteretic properties and zero field cooling (ZFC) susceptibility. The dependence of the irreversibi...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2005-03, Vol.289, p.118-121
Main Authors: Sousa, E.C., Alves, C.R., Aquino, R., Sousa, M.H., Goya, G.F., Rechenberg, H.R., Tourinho, F.A., Depeyrot, J.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic dynamics
Magnetic liquids
Magnetic naoparticles
Magnetic properties and materials
Physics
Spinel ferrites
Studies of specific magnetic materials
Surface effects
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Summary:The magnetic dynamics behavior of copper and nickel ferrite nanoparticles used in the magnetic fluid elaboration and with mean sizes between 3.5 to 10.4 nm is investigated by measurements of magnetic hysteretic properties and zero field cooling (ZFC) susceptibility. The dependence of the irreversibility field, inversely proportional to the particle size, clearly indicates that the magnetic anisotropy of our particles finds its origin on the surface layer.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2004.11.035