The role of faceting and elongation on the magnetic anisotropy of magnetite Fe3O4 nanocrystals

Moreno, Roberto; Poyser, Samuel; Meilak, Daniel; Meo, Andrea; Jenkins, Sarah; Lazarov, Vlado K.; Vallejo-Fernandez, Gonzalo; Majetich, Sara; Evans, Richard F.  L.

doi:10.1038/s41598-020-58976-7

Title: The role of faceting and elongation on the magnetic anisotropy of magnetite Fe₃O₄ nanocrystals

Journal Article · 17 February 2020 · Scientific Reports

DOI: https://doi.org/10.1038/s41598-020-58976-7 · OSTI ID:1619689

^[1]; Poyser, Samuel ^[2];

^[2];

^[3];

^[2]

Univ. of York (United Kingdom). Dept. of Physics; Univ. of Edinburgh, Scotland (United Kingdom). School of Geosciences. Earth and Planetary Science
Univ. of York (United Kingdom). Dept. of Physics
Carnegie Mellon Univ., Pittsburgh, PA (United States). Physics Dept.

Fe₃O₄ nanoparticles are one of the most promising candidates for biomedical applications such as magnetic hyperthermia and theranostics due to their bio-compatibility, structural stability and good magnetic properties. However, much is unknown about the nanoscale origins of the observed magnetic properties of particles due to the dominance of surface and finite size effects. Here we have developed an atomistic spin model of elongated magnetite nanocrystals to specifically address the role of faceting and elongation on the magnetic shape anisotropy. We find that for faceted particles simple analytical formulae overestimate the magnetic shape anisotropy and that the underlying cubic anisotropy makes a significant contribution to the energy barrier for moderately elongated particles. Our results enable a better estimation of the effective magnetic anisotropy of highly crystalline magnetite nanoparticles and is a step towards quantitative prediction of the heating effects of magnetic nanoparticles.

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Research Organization:: Carnegie Mellon Univ., Pittsburgh, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: FG02-08ER46481

OSTI ID:: 1619689

Alternate ID(s):: OSTI ID: 1629878

Journal Information:: Scientific Reports, Vol. 10, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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Fe ₃ O ₄ nanoparticles and nanocomposites with potential application in biomedicine and in communication technologies: Nanoparticle aggregation, interaction, and effective magnetic anisotropy Allia, P.; Barrera, G.; Tiberto, P. Journal of Applied Physics, Vol. 116, Issue 11 https://doi.org/10.1063/1.4895837	journal	September 2014
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Energy losses in interacting fine-particle magnetic composites Burrows, F.; Parker, C.; Evans, R. F. L. Journal of Physics D: Applied Physics, Vol. 43, Issue 47 https://doi.org/10.1088/0022-3727/43/47/474010	journal	November 2010
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Title: The role of faceting and elongation on the magnetic anisotropy of magnetite Fe3O4 nanocrystals

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Title: The role of faceting and elongation on the magnetic anisotropy of magnetite Fe₃O₄ nanocrystals