Langevin dynamic simulations of magnetic hyperthermia in rotating fields

The effect of a rotating magnetic field on heat dissipation due to magnetic hyperthermia is investigated numerically. A robust and validated in-house code based on Langevin Dynamics is used. High order asymptotic solutions of the temperature rate are used to validate the numerical approach. Comparisons between a rotating and an oscillatory excitation indicate a nonlinear response of the magnetic suspension with respect to the amplitude and frequency of the field. The relaxation time and volume fraction of particles also play a relevant role in this dynamics. A complete analysis on the effect of these parameters on the thermal response of the system is presented. The timescales of the problem and geometric features of the suspension micro-structure are used to interpret the results. Hysteresis curves and the real and imaginary components of the complex susceptibility are also presented in order to provide a clear physical description of the problem.

Automated summary

This study numerically investigates the effect of a rotating magnetic field on heat dissipation in magnetic hyperthermia. A validated code based on Langevin Dynamics is used to simulate the problem. The results show nonlinear response of the magnetic suspension to the amplitude and frequency of the field. The relaxation time and volume fraction of particles also influence the thermal response. The analysis provides insights into the system's behavior based on timescales and micro-structural features of the suspension.