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Modelling the effect of different core sizes and magnetic interactions inside magnetic nanoparticles on hyperthermia performance

Jonasson, Christian ; Schaller, Vincent ; Zeng, Lunjie ; Olsson, Eva ; Frandsen, Cathrine ; Castro, Alejandra ; Nilsson, Lars LU ; Bogart, Lara K. ; Southern, Paul and Pankhurst, Quentin A. , et al. (2019) In Journal of Magnetism and Magnetic Materials 477. p.198-202
Abstract
We present experimental intrinsic loss power (ILP) values, measured at an excitation frequency of 1 MHz and at relatively low field amplitudes of 3.4–9.9 kA/m, as a function of the mean core diameter, for selected magnetic nanoparticles (MNPs). The mean core sizes ranged from ca. 8 nm to 31 nm. Transmission electron microscopy indicated that those with smaller core sizes (less than ca. 22 nm) were single-core MNPs, while those with larger core sizes (ca. 29 nm to 31 nm) were multi-core MNPs. The ILP data showed a peak at core sizes of ca. 20 nm. We show here that this behaviour correlates well with the predicted ILP values obtained using either a non-interacting Debye model, or via dynamic Monte-Carlo simulations, the latter including... (More)
We present experimental intrinsic loss power (ILP) values, measured at an excitation frequency of 1 MHz and at relatively low field amplitudes of 3.4–9.9 kA/m, as a function of the mean core diameter, for selected magnetic nanoparticles (MNPs). The mean core sizes ranged from ca. 8 nm to 31 nm. Transmission electron microscopy indicated that those with smaller core sizes (less than ca. 22 nm) were single-core MNPs, while those with larger core sizes (ca. 29 nm to 31 nm) were multi-core MNPs. The ILP data showed a peak at core sizes of ca. 20 nm. We show here that this behaviour correlates well with the predicted ILP values obtained using either a non-interacting Debye model, or via dynamic Monte-Carlo simulations, the latter including core-core magnetic interactions for the multi-core particles. This alignment of the models is a consequence of the low field amplitudes used. We also present interesting results showing that the core-core interactions affect the ILP value differently depending on the mean core size. (Less)
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publishing date
type
Contribution to journal
publication status
published
in
Journal of Magnetism and Magnetic Materials
volume
477
pages
5 pages
publisher
Elsevier
external identifiers
  • scopus:85060279115
ISSN
0304-8853
language
English
LU publication?
no
id
c3f5103d-022d-49df-bb08-af7d891d1bb4
date added to LUP
2023-06-27 13:55:20
date last changed
2023-06-28 11:13:58
@article{c3f5103d-022d-49df-bb08-af7d891d1bb4,
  abstract     = {{We present experimental intrinsic loss power (ILP) values, measured at an excitation frequency of 1 MHz and at relatively low field amplitudes of 3.4–9.9 kA/m, as a function of the mean core diameter, for selected magnetic nanoparticles (MNPs). The mean core sizes ranged from ca. 8 nm to 31 nm. Transmission electron microscopy indicated that those with smaller core sizes (less than ca. 22 nm) were single-core MNPs, while those with larger core sizes (ca. 29 nm to 31 nm) were multi-core MNPs. The ILP data showed a peak at core sizes of ca. 20 nm. We show here that this behaviour correlates well with the predicted ILP values obtained using either a non-interacting Debye model, or via dynamic Monte-Carlo simulations, the latter including core-core magnetic interactions for the multi-core particles. This alignment of the models is a consequence of the low field amplitudes used. We also present interesting results showing that the core-core interactions affect the ILP value differently depending on the mean core size.}},
  author       = {{Jonasson, Christian and Schaller, Vincent and Zeng, Lunjie and Olsson, Eva and Frandsen, Cathrine and Castro, Alejandra and Nilsson, Lars and Bogart, Lara K. and Southern, Paul and Pankhurst, Quentin A. and Morales, M. Puerto and Johansson, Christer}},
  issn         = {{0304-8853}},
  language     = {{eng}},
  pages        = {{198--202}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Magnetism and Magnetic Materials}},
  title        = {{Modelling the effect of different core sizes and magnetic interactions inside magnetic nanoparticles on hyperthermia performance}},
  volume       = {{477}},
  year         = {{2019}},
}