Size distribution of FeNiB nanoparticles
1 Institute of Solid State Physics, Vienna University of Technology, A-1040 Vienna, Austria
2 Department of Physics, Faculty of Science, University Zagreb, HR-10000 Zagreb, Croatia
a Corresponding author: firstname.lastname@example.org
Published online: 3 July 2014
Two samples of amorphous nanoparticles FeNiB, one of them with SiO2 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 160 K (350 K) for the coated (uncoated) sample. With use of effective anisotropy constant Keff – 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.
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