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Open Access item Nanostructural origin of the spin and orbital contribution to the magnetic moment in Fe3−xO4 magnetite nanoparticles

Authors:Pérez, Nicolás
Bartolomé, Fernando
García, L. M.
Bartolomé, J. F.
Morales, M. P.
Serna, C. J.
Labarta, Amílcar
Batlle, Xavier
Keywords:Bonds (chemical), Electron microscopy, High-temperature effects, Iron compounds, Magnetic circular dichroism, Magnetic moments
Issue Date:5-Mar-2009
Publisher:American Institute of Physics
Citation:Applied Physics Letters 94(9): 093108 (2009)
Abstract:5 nm Fe3−xO4 nanoparticles were synthesized either by high-temperature decomposition in organic phase or in low-temperature aqueous conditions. In the first case oleic acid was covalently bonded to the nanoparticles; in the second case polyvinyl alcohol (PVA) yielded a protective coating without chemical bond. Magnetization measurements and x-ray magnetic circular dichroism showed a saturation magnetization close to bulk magnetite and an orbital moment effectively quenched in covalently bonded nanoparticles. PVA-coated nanoparticles showed a reduced value of the magnetization and ~3 fold increase in the orbital moment. High resolution electron microscopy suggested that this was related to the nanostructure of the samples.
Description:3 pages, 3 figures, 1 table.-- PACS: 75.30.Cr; 75.60.Ej; 75.50.Tt; 75.50.Pp; 61.46.Df; 78.20.Ls; 81.16.-c
Publisher version (URL):http://dx.doi.org/10.1063/1.3095484
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