Dynamical Origin of Highly Efficient Energy Dissipation in Soft Magnetic Nanoparticles for Magnetic Hyperthermia Applications

Abstract

The energy dissipation of a single-domain magnetic nanoparticle via its intrinsic damping can be used to achieve hyperthermia in biomedical applications. The authors propose a mechanism to convert the power of an oscillating magnetic field to heat through the energy dissipation of magnetically soft nanoparticles, based on their resonantly excited spin precession. The dissipation rate has its maximum at resonance, where the applied field rotates at the Larmor frequency. This mechanism provides specific loss power 10---100 times that of conventional means, with reliability and control.