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.

Magnetic relaxation

Multi-core particles

Monte-Carlo simulations

Magnetic nanoparticles

Magnetic interactions

Single-core particles

Författare

Christian Jonasson

RISE Acreo

Vincent Schaller

RISE Acreo

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 Acreo

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

2019-04-08