Physics Thesis

This is a copy of my thesis submitted in 2005 for honours in physics. Not pictured: blood, sweat and tears.

The Use of Magnetometry Techniques to Characterise the Size Distribution of Magnetic Nanoparticles

Abstract

The use of SQuID magnetometry to characterise the particle size distribution of magnetic nanoparticles was investigated using a variety of techniques and compared to results from transmission electron microscopy (TEM) and small angle neutron scattering (SANS). In particular, temperature dependent magnetic viscosity measurements were compared with other magnetometry techniques, and variations on typical experimental parameters were explored in order to gain a better picture of the size distribution and the effectiveness of various measurement techniques. Magnetic viscosity experiments on a sample of magnetite nanoparticles using an initial field of 100Oe were found to give a moment-weighted energy barrier distribution consistent with a log-normal distribution of particle diameters with a mean of 5.9nm and a standard deviation of 1.6nm, compared to values obtained from TEM of 3.7nm and 0.9nm, and SANS values of 3.2nm and 0.6nm.

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