Influence of particle size on superparamagnetic relaxation of MnFe2O4 particles in ferrofluids

Authors
Lopez, JL Pfannes, HD Paniago, R Tourinho, FA
Citation
Jl. Lopez et al., Influence of particle size on superparamagnetic relaxation of MnFe2O4 particles in ferrofluids, J MAGN MAGN, 226, 2001, pp. 1878-1880
Citations number
8
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN journal
03048853 → ACNP
Volume
226
Year of publication
2001
Part
2
Pages
1878 - 1880
Database
ISI
SICI code
0304-8853(200105)226:<1878:IOPSOS>2.0.ZU;2-9
Abstract
Dried water-based ionic ferrofluid powder samples containing MnFe2O4 spinel ferrite nanoparticles with average particle size of about 6 and 9 nm have been studied by Mossbauer spectroscopy and DC magnetization measurements. T he Mossbauer blocking temperature of the 6 nm sample was 290 K and that of the 9 nm sample 340 K. From DC magnetization measurements 'magnetic' diamet ers of 5.2 and 8 nm and a M-s of 41 and 48 emu/g were found for the two sam ples, respectively. (C) 2001 Published by Elsevier Science B.V.