Nano Archive

Structural and magnetic properties of uniform magnetite nanoparticles prepared by high temperature decomposition of organic precursors

Roca, A. G. and Morales, M. P. and O'Grady, K. and Serna, C. J. (2006) Structural and magnetic properties of uniform magnetite nanoparticles prepared by high temperature decomposition of organic precursors. NANOTECHNOLOGY, 17 (11). pp. 2783-2788.

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Official URL: http://dx.doi.org/10.1088/0957-4484/17/11/010

Abstract

Magnetite nanoparticles (Fe3O4) of three different sizes below the limit for single domain magnetic behaviour have been obtained by thermal decomposition of an iron precursor in an organic medium in the presence of a surfactant. Good agreement between mean particle size obtained by TEM, crystal size calculated from x-ray diffraction and magnetic diameter calculated from magnetization curves measured at room temperature shows that the samples consist of uniform, crystalline and isolated magnetite nanoparticles with sizes between 5 and 11 nm. High saturation magnetization and high initial susceptibility values have been found, the latter decreasing as the particle size decreases. The main contribution to the anisotropy is magnetocrystalline and shape anisotropy, since surface anisotropy is suppressed by the oleic acid molecules which are covalently bonded to the nanoparticle surface.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Physical Science > Nanomagnetics
Material Science > Nanostructured materials
ID Code:3733
Deposited By:Farnush Anwar
Deposited On:22 Jan 2009 14:06
Last Modified:22 Jan 2009 14:06

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