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

Research output: Research - peer-reviewJournal article – Annual report year: 2019

  • Author: Jonasson, Christian

    RISE Acreo AB, Sweden

  • Author: Schaller, Vincent

    RISE Acreo AB, Sweden

  • Author: Zeng, Lunjie

    Chalmers University of Technology, Sweden

  • Author: Olsson, Eva

    Chalmers University of Technology, Sweden

  • Author: Frandsen, Cathrine

    Neutrons and X-rays for Materials Physics, Department of Physics, Technical University of Denmark, Fysikvej, 2800, Kgs. Lyngby, Denmark

  • Author: Castro, Alejandra

    SOLVE Research and Consultancy AB, Sweden

  • Author: Nilsson, Lars

    SOLVE Research and Consultancy AB, Sweden

  • Author: Bogart, Lara K.

    University College London, United Kingdom

  • Author: Southern, Paul

    University College London, United Kingdom

  • Author: Pankhurst, Quentin A.

    University College London, Sweden

  • Author: Morales, Puerto

    Instituto de CC. de Materiales de Madrid (ICMM-CSIC), Spain

  • Author: Johansson, Christer

    RISE Acreo AB, Sweden

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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
StatePublished - 2019
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

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