Modelling the effect of different core sizes and magnetic interactions inside magnetic nanoparticles on hyperthermia performance
Artikel i vetenskaplig tidskrift, 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.

Single-core particles

Magnetic interactions

Magnetic nanoparticles

Magnetic relaxation

Multi-core particles

Monte-Carlo simulations

Författare

Christian Jonasson

RISE Research Institutes of Sweden

Vincent Schaller

RISE Research Institutes of Sweden

Lunjie Zeng

Eva Olsson

C. Frandsen

Danmarks Tekniske Universitet (DTU)

Alejandra Castro

Solve Research & Consultancy

Lars Nilsson

Solve Research & Consultancy

Lara K. Bogart

University College London (UCL)

P. Southern

University College London (UCL)

Q. A. Pankhurst

University College London (UCL)

M. Puerto Morales

CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)

Christer Johansson

RISE Research Institutes of Sweden

Journal of Magnetism and Magnetic Materials

0304-8853 (ISSN)

Vol. 477 198-202

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik

DOI

10.1016/j.jmmm.2018.09.117

Mer information

Senast uppdaterat

2019-10-03