Effect of the distribution of anisotropy constants on the magnetic properties of iron oxide nanoparticles

Daniel Clarke; C Marquina; David Lloyd; Gonzalo Vallejo Fernandez

doi:10.1016/j.jmmm.2022.169543

Effect of the distribution of anisotropy constants on the magnetic properties of iron oxide nanoparticles

Daniel Clarke, C Marquina, David Lloyd, Gonzalo Vallejo Fernandez

Research output: Contribution to journal › Article › peer-review

Abstract

The distribution of shape anisotropy constants in two colloids of iron oxide
nanoparticles has been measured from the distribution of particle elongations within each system. The results are in good agreement with the values calculated from a temperature decay of remanence measurement. For a fluid with a saturation magnetisation of 420 emu/cc and an average particle elongation of ~1.3, the distribution of energy barriers is controlled by both the distribution of particle sizes and particle elongations. For a fluid with a saturation magnetisation of 320 emu/cc and a wide distribution of particle sizes, the energy barrier to reversal can be assumed to be controlled by the distribution of particle volumes. These results highlight the need to take into account the distribution of anisotropy constants when making predictions of the heating properties of assemblies of magnetic nanoparticles for hyperthermia applications.

Original language	English
Article number	169543
Number of pages	5
Journal	Journal of Magnetism and Magnetic Materials
Volume	559
Early online date	31 May 2022
DOIs	https://doi.org/10.1016/j.jmmm.2022.169543
Publication status	Published - 1 Oct 2022

Bibliographical note

Access to Document

10.1016/j.jmmm.2022.169543Licence: CC BY

Effect of the distribution of anisotropy constants on the magnetic properties of iron oxide nanoparticles
© 2022 The Authors
Final published version, 2.09 MBLicence: CC BY

Cite this

@article{bc542dda56f04f1a93a0906e523c4f01,

title = "Effect of the distribution of anisotropy constants on the magnetic properties of iron oxide nanoparticles",

abstract = "The distribution of shape anisotropy constants in two colloids of iron oxidenanoparticles has been measured from the distribution of particle elongations within each system. The results are in good agreement with the values calculated from a temperature decay of remanence measurement. For a fluid with a saturation magnetisation of 420 emu/cc and an average particle elongation of ~1.3, the distribution of energy barriers is controlled by both the distribution of particle sizes and particle elongations. For a fluid with a saturation magnetisation of 320 emu/cc and a wide distribution of particle sizes, the energy barrier to reversal can be assumed to be controlled by the distribution of particle volumes. These results highlight the need to take into account the distribution of anisotropy constants when making predictions of the heating properties of assemblies of magnetic nanoparticles for hyperthermia applications.",

author = "Daniel Clarke and C Marquina and David Lloyd and {Vallejo Fernandez}, Gonzalo",

note = "{\textcopyright} 2022 The Authors",

year = "2022",

month = oct,

day = "1",

doi = "10.1016/j.jmmm.2022.169543",

language = "English",

volume = "559",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

}

TY - JOUR

T1 - Effect of the distribution of anisotropy constants on the magnetic properties of iron oxide nanoparticles

AU - Clarke, Daniel

AU - Marquina, C

AU - Lloyd, David

AU - Vallejo Fernandez, Gonzalo

PY - 2022/10/1

Y1 - 2022/10/1

N2 - The distribution of shape anisotropy constants in two colloids of iron oxidenanoparticles has been measured from the distribution of particle elongations within each system. The results are in good agreement with the values calculated from a temperature decay of remanence measurement. For a fluid with a saturation magnetisation of 420 emu/cc and an average particle elongation of ~1.3, the distribution of energy barriers is controlled by both the distribution of particle sizes and particle elongations. For a fluid with a saturation magnetisation of 320 emu/cc and a wide distribution of particle sizes, the energy barrier to reversal can be assumed to be controlled by the distribution of particle volumes. These results highlight the need to take into account the distribution of anisotropy constants when making predictions of the heating properties of assemblies of magnetic nanoparticles for hyperthermia applications.

AB - The distribution of shape anisotropy constants in two colloids of iron oxidenanoparticles has been measured from the distribution of particle elongations within each system. The results are in good agreement with the values calculated from a temperature decay of remanence measurement. For a fluid with a saturation magnetisation of 420 emu/cc and an average particle elongation of ~1.3, the distribution of energy barriers is controlled by both the distribution of particle sizes and particle elongations. For a fluid with a saturation magnetisation of 320 emu/cc and a wide distribution of particle sizes, the energy barrier to reversal can be assumed to be controlled by the distribution of particle volumes. These results highlight the need to take into account the distribution of anisotropy constants when making predictions of the heating properties of assemblies of magnetic nanoparticles for hyperthermia applications.

U2 - 10.1016/j.jmmm.2022.169543

DO - 10.1016/j.jmmm.2022.169543

M3 - Article

SN - 0304-8853

VL - 559

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

M1 - 169543

ER -