Magnetic nanoparticles with bulk-like properties

Details Magnetic nanoparticles with bulk-like properties Magnetic nanoparticles with bulk-like properties

2010-11-11

arxiv.org/abs/1011.2573v1

Journal of Applied Physics 109, 07B524 (2011)

Physics

Condensed Matter

Materials Science

Review article. 20 pages, 7 figures. Invited contribution to 55th MMM Conference 2010 (Atlanta), Session HG-01. To be publishe

Scientific paper

10.1063/1.3559504

The magnetic behavior of $Fe_{3-x}O_4$ nanoparticles synthesized either by high-temperature decomposition of an organic iron precursor or low-temperature co-precipitation in aqueous conditions, is compared. Transmission electron microscopy, X-ray absorption spectroscopy, X-ray magnetic circular dichroism and magnetization measurements show that nanoparticles synthesized by thermal decomposition display high crystal quality and bulk-like magnetic and electronic properties, while nanoparticles synthesized by co-precipitation show much poorer crystallinity and particle-like phenomenology, including reduced magnetization, high closure fields and shifted hysteresis loops. The key role of the crystal quality is thus suggested since particle-like behavior for particles larger than about 5 nm is only observed when they are structurally defective. These conclusions are supported by Monte Carlo simulations. It is also shown that thermal decomposition is capable of producing nanoparticles that, after further stabilization in physiological conditions, are suitable for biomedical applications such as magnetic resonance imaging or bio-distribution studies.

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