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

Abstract

Abstract Fe 3 O 4 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.

Authors:
ORCiD logo; ; ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1619689
Alternate Identifier(s):
OSTI ID: 1629878
Grant/Contract Number:  
FG02-08ER46481
Resource Type:
Published Article
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Name: Scientific Reports Journal Volume: 10 Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United Kingdom
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Moreno, Roberto, Poyser, Samuel, Meilak, Daniel, Meo, Andrea, Jenkins, Sarah, Lazarov, Vlado K., Vallejo-Fernandez, Gonzalo, Majetich, Sara, and Evans, Richard F. L.. The role of faceting and elongation on the magnetic anisotropy of magnetite Fe3O4 nanocrystals. United Kingdom: N. p., 2020. Web. https://doi.org/10.1038/s41598-020-58976-7.
Moreno, Roberto, Poyser, Samuel, Meilak, Daniel, Meo, Andrea, Jenkins, Sarah, Lazarov, Vlado K., Vallejo-Fernandez, Gonzalo, Majetich, Sara, & Evans, Richard F. L.. The role of faceting and elongation on the magnetic anisotropy of magnetite Fe3O4 nanocrystals. United Kingdom. https://doi.org/10.1038/s41598-020-58976-7
Moreno, Roberto, Poyser, Samuel, Meilak, Daniel, Meo, Andrea, Jenkins, Sarah, Lazarov, Vlado K., Vallejo-Fernandez, Gonzalo, Majetich, Sara, and Evans, Richard F. L.. Mon . "The role of faceting and elongation on the magnetic anisotropy of magnetite Fe3O4 nanocrystals". United Kingdom. https://doi.org/10.1038/s41598-020-58976-7.
@article{osti_1619689,
title = {The role of faceting and elongation on the magnetic anisotropy of magnetite Fe3O4 nanocrystals},
author = {Moreno, Roberto and Poyser, Samuel and Meilak, Daniel and Meo, Andrea and Jenkins, Sarah and Lazarov, Vlado K. and Vallejo-Fernandez, Gonzalo and Majetich, Sara and Evans, Richard F. L.},
abstractNote = {Abstract Fe 3 O 4 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.},
doi = {10.1038/s41598-020-58976-7},
journal = {Scientific Reports},
number = 1,
volume = 10,
place = {United Kingdom},
year = {2020},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1038/s41598-020-58976-7

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Cited by: 3 works
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