To the effect of interparticle interaction on dynamic remagnetization of ferromagnetic nanoparticles

The paper deals with theoretical study of effect of interparticle interaction on the complex magnetic susceptibility and the rate of magnetic energy dissipation in a system of single-domain ferromagnetic particles, immobilized in a non-magnetic media. A real prototype of this model can be a biological tissue with embedded magnetic nanoparticles for hyperthermia therapy of tumor (cancer) diseases. Based on mathematically regular methods of statistical physics, we have shown that, depending on frequency of the applied field, the interparticle interaction can either increase or decrease the energy dissipation, and, therefore, the heat production in the system. We hope that the obtained results can help to explain qualitative contradictions between conclusions of various experimental and theoretical studies of influence of the interparticle interactions on the thermal effect in tissues with embedded magnetic particles.