General overview »
Magnetic Nanoparticles »
Standardization »
Characterization and
analysis methods »
DC magnetization and AC
susceptometer analysis »
Medium and high frequency
AC susceptometry »
Mössbauer spectroscopy »
Electron microscopy »
XRD and SAXS »
SANS »
Electron microscopy »
Ferromagnetic resonance »
Dynamic light scattering and
electrophoretic light scattering »
Fieldflow fractionation »
Magnetic modelling »
Magnetorelaxometry »
Magnetic particle spectroscopy »
Magnetic particle rotation »
Magnetic separation »
NMR R1 and R2 relaxivities »
Magnetic nanoparticle biodetection »
Magnetic hyperthermia measurements »


Magnetic modelling
In order to understand the results from the different analysis methods we have to build magnetic models of the magnetic particle systems. In many cases, e.g., applying the Langevin function to explain static MH curves and using the moment superposition model (MSM) for the calculation of magnetorelaxometry and AC susceptibility measurements, interactions between individual magnetic nanoparticles are neglected. However, for suspensions with comparably large nanoparticle concentrations, for particles with large magnetic moments and this shells, and in the case of multicore particles where there are large magnetic interactions between the singledomain crystals that build up the particle, these interactions must be taken into account in the different analysis. Especially with regard to Magnetic Particle Spectroscopy (MPS) and Magnetic Particle Imaging (MPI) where AC magnetic fields with large amplitudes are applied, accurate models are still lacking. We will use for instance Monte Carlo methods in order to take into account the effects of magnetic interactions, size distribution and magnetic anisotropy on the magnetization response.
