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About this Abstract
Meeting	2021 TMS Annual Meeting & Exhibition
Symposium	Characterization of Materials through High Resolution Imaging
Presentation Title	Magnetic Correlations and Time Fluctuations in Assemblies of Fe3O4 Nanoparticles Probed via X-rays
Author(s)	Karine Chesnel
On-Site Speaker (Planned)	Karine Chesnel
Abstract Scope	Magnetic nanoparticles are increasingly used in biomedical applications such as drug-delivery, gene delivery, hyperthermia, or contrast agents for MRI. Magnetite (Fe3O4) nanoparticles are good candidates for these applications due to their non-toxicity and long-life in the bloodstream. Here we show inter-particle magnetic correlations probed at the nanoscale via x-ray resonant magnetic scattering (XRMS). We show the dependence on particle size, varying from 5 to 11 nm, suggesting an enhancement of magnetic couplings for bigger particles. Additionally, we show a model based on chains of nanoparticles. The data fitting suggests ferromagnetic ordering when an external magnetic field is applied, but the emergence of antiferromagnetic ordering at remanence. Additionally we will present photon correlation data that show the dynamics of fluctuation throughout the superparamagnetic blocking transition.
Proceedings Inclusion?	Planned:

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