TITLE

Nanostructural origin of the spin and orbital contribution to the magnetic moment in Fe3-xO4 magnetite nanoparticles

AUTHOR(S)
Pérez, N.; Bartolomé, F.; García, L. M.; Bartolomé, J.; Morales, M. P.; Serna, C. J.; Labarta, A.; Batlle, X.
PUB. DATE
March 2009
SOURCE
Applied Physics Letters;3/2/2009, Vol. 94 Issue 9, pN.PAG
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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.
ACCESSION #
36940974

 

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