Determining Magnetic Nanoparticle Size Distributions from Thermomagnetic Measurements
R.S. DiPietro, H.G. Johnson, S.P. Bennett, T.J. Nummy, L.H. Lewis, and, D. Heiman
TL;DR
This paper introduces an analytical method to determine the size distribution and anisotropy of superparamagnetic nanoparticles using thermomagnetic measurements, enabling rapid and quantitative analysis of nanoparticle ensembles.
Contribution
The paper presents a new analytical transformation technique that extracts nanoparticle size distribution and anisotropy from temperature-dependent ZFC magnetization data.
Findings
Log-normal size distribution of MnAs nanoparticles
Reduced anisotropy compared to bulk materials
Effective rapid assessment method for nanoparticle ensembles
Abstract
Thermomagnetic measurements are used to obtain the size distribution and anisotropy of magnetic nanoparticles. An analytical transformation method is described which utilizes temperature-dependent zero-field cooling (ZFC) magnetization data to provide a quantitative measurement of the average diameter and relative abundance of superparamagnetic nanoparticles. Applying this method to self-assembled MnAs nanoparticles in MnAs-GaAs composite films reveals a log-normal size distribution and reduced anisotropy for nanoparticles compared to bulk materials. This analytical technique holds promise for rapid assessment of the size distribution of an ensemble of superparamagnetic nanoparticles.
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