Magnetic Force Microscopy of Micropatterned Clusters of Superparamagnetic Iron Oxide Nanoparticles
Kenzington L. Kottenbrock, Sierra Reis, Gunjan Agarwal, Samuel D. Oberdick
TL;DR
Researchers used magnetic force microscopy to study the magnetic properties of patterned clusters of iron oxide nanoparticles.
Contribution
The study reveals how magnetic interactions affect MFM measurements and how cluster geometry influences these effects.
Findings
MFM phase shift from magnetic interactions was detectable at lift heights of several hundred nanometers.
Magnetic interactions caused an apparent 'ballooning' of the feature size in MFM images.
The results help understand how to detect SPIONs in biological environments using MFM.
Abstract
Magnetic force microscopy (MFM) was used to characterize micropatterned clusters of superparamagnetic iron oxide nanoparticles (SPIONs). Top-down lithography was used to create SPION aggregates with well-defined geometries. The micrometer-scale aggregates exhibited different properties from individual particles and from smaller clusters containing just a few particles. The MFM phase shift from magnetic interactions between the sample and probe tip could be detected at lift heights of several hundred nanometers. The experimental data was compared to a magnetic dipole–dipole interaction model to understand the relationship between MFM phase shift and lift height. Magnetic interactions between the probe tip and the sample also led to an apparent “ballooning” of the feature size, where the aggregates appeared larger with MFM than their physical size obtained from scanning electron…
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Taxonomy
TopicsCharacterization and Applications of Magnetic Nanoparticles · Iron oxide chemistry and applications · Minerals Flotation and Separation Techniques