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Título : Nanostructural origin of the spin and orbital contribution to the magnetic moment in Fe3−xO4 magnetite nanoparticles
Autor : Pérez, Nicolás, Bartolomé, Fernando, García, L. M., Bartolomé, J. F., Morales, M. P., Serna, C. J., Labarta, Amílcar, Batlle, Xavier
Palabras clave : Bonds (chemical)
Electron microscopy
High-temperature effects
Iron compounds
Magnetic circular dichroism
Magnetic moments
Fecha de publicación : 5-Mar-2009
Editor: American Institute of Physics
Resumen: 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.
Descripción : 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
Versión del editor: http://dx.doi.org/10.1063/1.3095484
URI : http://hdl.handle.net/10261/21652
ISSN: 0003-6951
DOI: 10.1063/1.3095484
Citación : Applied Physics Letters 94(9): 093108 (2009)
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