Modelling the effect of different core sizes and magnetic interactions inside magnetic nanoparticles on hyperthermia performance
Research output: Research - peer-review › Journal article – Annual report year: 2019
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 language | English |
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Journal | Journal of Magnetism and Magnetic Materials |
Volume | 477 |
Pages (from-to) | 198-202 |
Number of pages | 5 |
ISSN | 0304-8853 |
DOIs | |
State | Published - 2019 |
Citations | Web of Science® Times Cited: No match on DOI |
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- Magnetic interactions, Magnetic nanoparticles, Magnetic relaxation, Monte-Carlo simulations, Multi-core particles, Single-core particles
Research areas
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