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Magnetic properties of uniform γ–Fe2O3 nanoparticles smaller than 5 nm prepared by laser pyrolysis

Published online by Cambridge University Press:  31 January 2011

M. P. Morales ,
S. Veintemillas-Verdaguer  and
C. J. Serna
M. P. Morales*
Affiliation:
Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco 28049, Madrid, Spain
S. Veintemillas-Verdaguer
Affiliation:
Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco 28049, Madrid, Spain
C. J. Serna
Affiliation:
Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco 28049, Madrid, Spain
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

γ–Fe2O3 spherical particles with diameters between 5 and 3.5 nm—very uniform in size—have been prepared by laser pyrolysis of iron pentacarbonyl. The infrared spectra of the samples showed features that indicated different degrees of crystallinity according to the preparation conditions. Low saturation magnetization values (≈10 emu/g) and very high coercivities at low temperature (3000 Oe) have been found for the γ–Fe2O3 nanoparticles with the smaller particle size and the highest structural disorder. To explain the magnetic properties, it was necessary to consider additional anisotropies caused by the increase in surface and structural disorder as the particle size decreased.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 7 , July 1999 , pp. 3066 - 3072
Copyright
Copyright © Materials Research Society 1999

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