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Modelling the effect of different core sizes and magnetic interactions inside magnetic nanoparticles on hyperthermia performance
RISE - Research Institutes of Sweden, ICT, Acreo.
RISE - Research Institutes of Sweden, ICT, Acreo.
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.
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2019 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 477, p. 198-202Article in journal (Refereed) Published
Abstract [en]

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 to 9.9 kA/m, as a function of the mean core diameter, for selected magnetic nanoparticle (MNP). 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 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.

Place, publisher, year, edition, pages
2019. Vol. 477, p. 198-202
Keywords [en]
magnetic nanoparticles, magnetic interactions, magnetic relaxation, Monte-Carlo simulations, multi-core particles, single-core particles
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-36361DOI: 10.1016/j.jmmm.2018.09.117Scopus ID: 2-s2.0-85060279115OAI: oai:DiVA.org:ri-36361DiVA, id: diva2:1266268
Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2019-06-27Bibliographically approved

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Publisher's full textScopushttp://www.sciencedirect.com/science/article/pii/S0304885318320067

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Johansson, Christer

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