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

Christian Jonasson*, Vincent Schaller, Lunjie Zeng, Eva Olsson, Cathrine Frandsen, Alejandra Castro, Lars Nilsson, Lara K. Bogart, Paul Southern, Quentin A. Pankhurst, M. Puerto Morales, Christer Johansson

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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.
Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Volume477
Pages (from-to)198-202
Number of pages5
ISSN0304-8853
DOIs
Publication statusPublished - 2019

Keywords

  • Magnetic interactions
  • Magnetic nanoparticles
  • Magnetic relaxation
  • Monte-Carlo simulations
  • Multi-core particles
  • Single-core particles

Cite this

Jonasson, Christian ; Schaller, Vincent ; Zeng, Lunjie ; Olsson, Eva ; Frandsen, Cathrine ; Castro, Alejandra ; Nilsson, Lars ; Bogart, Lara K. ; Southern, Paul ; Pankhurst, Quentin A. ; Morales, M. Puerto ; Johansson, Christer. / Modelling the effect of different core sizes and magnetic interactions inside magnetic nanoparticles on hyperthermia performance. In: Journal of Magnetism and Magnetic Materials. 2019 ; Vol. 477. pp. 198-202.
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title = "Modelling the effect of different core sizes and magnetic interactions inside magnetic nanoparticles on hyperthermia performance",
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.",
keywords = "Magnetic interactions, Magnetic nanoparticles, Magnetic relaxation, Monte-Carlo simulations, Multi-core particles, Single-core particles",
author = "Christian Jonasson and Vincent Schaller and Lunjie Zeng and Eva Olsson and Cathrine Frandsen and Alejandra Castro and Lars Nilsson and Bogart, {Lara K.} and Paul Southern and Pankhurst, {Quentin A.} and Morales, {M. Puerto} and Christer Johansson",
year = "2019",
doi = "10.1016/j.jmmm.2018.09.117",
language = "English",
volume = "477",
pages = "198--202",
journal = "Journal of Magnetism and Magnetic Materials",
issn = "0304-8853",
publisher = "Elsevier",

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Jonasson, C, Schaller, V, Zeng, L, Olsson, E, Frandsen, C, Castro, A, Nilsson, L, Bogart, LK, Southern, P, Pankhurst, QA, Morales, MP & Johansson, C 2019, 'Modelling the effect of different core sizes and magnetic interactions inside magnetic nanoparticles on hyperthermia performance', Journal of Magnetism and Magnetic Materials, vol. 477, pp. 198-202. https://doi.org/10.1016/j.jmmm.2018.09.117

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; Bogart, Lara K.; Southern, Paul; Pankhurst, Quentin A.; Morales, M. Puerto; Johansson, Christer.

In: Journal of Magnetism and Magnetic Materials, Vol. 477, 2019, p. 198-202.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Modelling the effect of different core sizes and magnetic interactions inside magnetic nanoparticles on hyperthermia performance

AU - Jonasson, Christian

AU - Schaller, Vincent

AU - Zeng, Lunjie

AU - Olsson, Eva

AU - Frandsen, Cathrine

AU - Castro, Alejandra

AU - Nilsson, Lars

AU - Bogart, Lara K.

AU - Southern, Paul

AU - Pankhurst, Quentin A.

AU - Morales, M. Puerto

AU - Johansson, Christer

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

KW - Magnetic interactions

KW - Magnetic nanoparticles

KW - Magnetic relaxation

KW - Monte-Carlo simulations

KW - Multi-core particles

KW - Single-core particles

U2 - 10.1016/j.jmmm.2018.09.117

DO - 10.1016/j.jmmm.2018.09.117

M3 - Journal article

VL - 477

SP - 198

EP - 202

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

ER -