Regensburg 2019 – wissenschaftliches Programm
CPP 25.8: Poster
Dienstag, 2. April 2019, 14:00–16:00, Poster B1
Dynamic susceptibility of a cluster interacting superparamagnetic particles in an oscillating magnetic field — •Vladimir Zverev and Alexandr Ambarov — Ural Federal University, Ekaterinburg, Russia
At the present moment several methods for reconstructing the spatial distribution of magnetic particles are being developed. Most of them are based on measurements of the dynamic susceptibility and an ensemble of magnetic nanoparticles is used as a sensitive element. Multicore magnetic nanoparticles allow an increase the temporal resolution and improves the signal-to-noise ratio. In this work we investigate dynamic response of a single cluster of an ensemble of interacting ferroparticles that are formed multicore magnetic particle. It is assumed that the relaxation of the magnetic moments occurs due to Neel mechanism. Dynamic response of a cluster of single-domain particles in a viscous carrier are determined from the solution of the Fokker-Planck equation. The modified mean-field approach of first-order is used to take into account the dipole-dipole interaction. The time dependence of the magnetization is calculated to determine effective magnetic moment and relaxation time.