Large enhancements of magnetic anisotropy in oxide-free iron nanoparticles

Todd C. Monson; Eugene L. Venturini; Valeri Petkov; Yang Ren; Judith M. Lavin; Dale L. Huber

doi:10.1016/j.jmmm.2012.11.026

Large enhancements of magnetic anisotropy in oxide-free iron nanoparticles

Todd C. Monson
, Eugene L. Venturini
, Valeri Petkov
, Yang Ren
, Judith M. Lavin
, Dale L. Huber

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

23 Citations (Scopus)

Abstract

Magnetic characterization of spherical, oxide-free, bcc iron nanoparticles synthesized with β-diketone surfactants has been performed. The results of this characterization, which included particles with diameters ranging between 2 and 5 nm show that the nanoparticles have an average anisotropy of 1.9×10⁶±0.3×10⁶ J/m³, which is more than an order of magnitude greater than the magnetocrystalline anisotropy of bulk iron. Despite their unusually large anisotropy, these particles can have saturation magnetizations of up to 210 A m²/kg (slightly lower than bulk iron). High-energy X-ray diffraction data indicates that the Fe particles have a distorted bcc lattice, which could, at least in part, explain the magnetic behavior of these nanoparticles. Dipolar coupling between particles, while present, is weak and cannot account for the high anisotropy of these nanoparticles. © 2012 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	156-161
Journal	Journal of Magnetism and Magnetic Materials
Volume	331
DOIs	https://doi.org/10.1016/j.jmmm.2012.11.026
Publication status	Published - Apr 2013
Externally published	Yes

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Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Research Keywords

Anisotropy
Iron
Nanoparticle
Pair distribution function
Superparamagnetism

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title = "Large enhancements of magnetic anisotropy in oxide-free iron nanoparticles",

abstract = "Magnetic characterization of spherical, oxide-free, bcc iron nanoparticles synthesized with β-diketone surfactants has been performed. The results of this characterization, which included particles with diameters ranging between 2 and 5 nm show that the nanoparticles have an average anisotropy of 1.9×106±0.3×106 J/m3, which is more than an order of magnitude greater than the magnetocrystalline anisotropy of bulk iron. Despite their unusually large anisotropy, these particles can have saturation magnetizations of up to 210 A m2/kg (slightly lower than bulk iron). High-energy X-ray diffraction data indicates that the Fe particles have a distorted bcc lattice, which could, at least in part, explain the magnetic behavior of these nanoparticles. Dipolar coupling between particles, while present, is weak and cannot account for the high anisotropy of these nanoparticles. {\textcopyright} 2012 Elsevier B.V. All rights reserved.",

keywords = "Anisotropy, Iron, Nanoparticle, Pair distribution function, Superparamagnetism",

author = "Monson, \{Todd C.\} and Venturini, \{Eugene L.\} and Valeri Petkov and Yang Ren and Lavin, \{Judith M.\} and Huber, \{Dale L.\}",

note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].",

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T1 - Large enhancements of magnetic anisotropy in oxide-free iron nanoparticles

AU - Monson, Todd C.

AU - Venturini, Eugene L.

AU - Petkov, Valeri

AU - Ren, Yang

AU - Lavin, Judith M.

AU - Huber, Dale L.

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2013/4

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N2 - Magnetic characterization of spherical, oxide-free, bcc iron nanoparticles synthesized with β-diketone surfactants has been performed. The results of this characterization, which included particles with diameters ranging between 2 and 5 nm show that the nanoparticles have an average anisotropy of 1.9×106±0.3×106 J/m3, which is more than an order of magnitude greater than the magnetocrystalline anisotropy of bulk iron. Despite their unusually large anisotropy, these particles can have saturation magnetizations of up to 210 A m2/kg (slightly lower than bulk iron). High-energy X-ray diffraction data indicates that the Fe particles have a distorted bcc lattice, which could, at least in part, explain the magnetic behavior of these nanoparticles. Dipolar coupling between particles, while present, is weak and cannot account for the high anisotropy of these nanoparticles. © 2012 Elsevier B.V. All rights reserved.

AB - Magnetic characterization of spherical, oxide-free, bcc iron nanoparticles synthesized with β-diketone surfactants has been performed. The results of this characterization, which included particles with diameters ranging between 2 and 5 nm show that the nanoparticles have an average anisotropy of 1.9×106±0.3×106 J/m3, which is more than an order of magnitude greater than the magnetocrystalline anisotropy of bulk iron. Despite their unusually large anisotropy, these particles can have saturation magnetizations of up to 210 A m2/kg (slightly lower than bulk iron). High-energy X-ray diffraction data indicates that the Fe particles have a distorted bcc lattice, which could, at least in part, explain the magnetic behavior of these nanoparticles. Dipolar coupling between particles, while present, is weak and cannot account for the high anisotropy of these nanoparticles. © 2012 Elsevier B.V. All rights reserved.

KW - Anisotropy

KW - Iron

KW - Nanoparticle

KW - Pair distribution function

KW - Superparamagnetism

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U2 - 10.1016/j.jmmm.2012.11.026

DO - 10.1016/j.jmmm.2012.11.026

M3 - RGC 21 - Publication in refereed journal

SN - 0304-8853

VL - 331

SP - 156

EP - 161

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

ER -

Large enhancements of magnetic anisotropy in oxide-free iron nanoparticles

Abstract

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Research Keywords

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