Size distribution of FeNiB nanoparticles

Two samples of amorphous nanoparticles FeNiB, one of them with SiO sub(2) sheath around the core and one without, were investigated by transmission electron microscopy and magnetic measurements. The coating gives mean particle diameters of 4.3 nm compared to 7.2 nm for the uncoated particles. Magnet...

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Bibliographic Details
Published in:EPJ Web of conferences 2014-01, Vol.75, p.5008-1-05008-4
Main Authors: Lackner, P., Pajic, D., Reissner, M., Novosel, N., Zadro, K., Stöger-Pollach, M., Babic, E.
Format: Article
Language:English
Subjects:
Clusters
Coating
Constants
Hysteresis loops
Magnetic measurement
Nanoparticles
Particle size distribution
Transmission electron microscopy
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Summary:Two samples of amorphous nanoparticles FeNiB, one of them with SiO sub(2) sheath around the core and one without, were investigated by transmission electron microscopy and magnetic measurements. The coating gives mean particle diameters of 4.3 nm compared to 7.2 nm for the uncoated particles. Magnetic measurements prove superparamagnetic behaviour above 160K (350 K) for the coated (uncoated) sample. With use of effective anisotropy constant K sub(eff) - determined from hysteresis loops - size distributions are determined both from ZFC curves, as well as from relaxation measurements. Both are in good agreement and are very similar for both samples. Comparison with the size distribution determined from TEM pictures shows that magnetic clusters consist of only few physical particles.
ISSN:2100-014X
2100-014X
DOI:10.1051/epjconf/20147505008