Energy dissipation in single-domain ferromagnetic nanoparticles: Dynamical approach

TL;DR

This paper investigates energy dissipation in single-domain ferromagnetic nanoparticles under alternating magnetic fields, analyzing power loss through the Landau-Lifshitz-Gilbert equation to optimize heating conditions.

Contribution

It provides a combined analytical and numerical analysis of power loss in nanoparticles driven by magnetic fields, focusing on different polarization regimes and maximizing heating efficiency.

Findings

Power loss depends on field amplitude and frequency.

Circular and linear polarization regimes induce different precession behaviors.

Conditions for maximizing nanoparticle heating are identified.

Abstract

We study, both analytically and numerically, the phenomenon of energy dissipation in single-domain ferromagnetic nanoparticles driven by an alternating magnetic field. Our interest is focused on the power loss resulting from the Landau-Lifshitz-Gilbert equation, which describes the precessional motion of the nanoparticle magnetic moment. We determine the power loss as a function of the field amplitude and frequency and analyze its dependence on different regimes of forced precession induced by circularly and linearly polarized magnetic fields. The conditions to maximize the nanoparticle heating are also analyzed.