Jonasson, C;
Schaller, V;
Zeng, L;
Olsson, E;
Frandsen, C;
Castro, A;
Nilsson, L;
... Johansson, C; + view all
(2019)
Modelling the effect of different core sizes and magnetic interactions inside magnetic nanoparticles on hyperthermia performance.
Journal Of Magnetism And Magnetic Materials
, 477
pp. 198-202.
10.1016/j.jmmm.2018.09.117.
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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.
| Type: | Article |
|---|---|
| Title: | Modelling the effect of different core sizes and magnetic interactions inside magnetic nanoparticles on hyperthermia performance |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jmmm.2018.09.117 |
| Publisher version: | https://doi.org/10.1016/j.jmmm.2018.09.117 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | magnetic nanoparticles, magnetic interactions, magnetic relaxation, Monte-Carlo simulations, multi-core particles, single-core particles. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10078065 |
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