Magnetic particle hyperthermia: Power losses under circularly polarized field in anisotropic nanoparticles

Abstract

The deterministic Landau-Lifshitz-Gilbert equation has been used to investigate the nonlinear dynamics of magnetization and the specific loss power in magnetic nanoparticles with uniaxial anisotropy driven by a rotating magnetic field, generalizing the results obtained for the isotropic case found in [P. F. de Chatel, I. Nandori, J. Hakl, S. Meszaros and K. Vad, J. Phys.: Condens. Matter 21, 124202 (2009)]. As opposed to many applications of magnetization reversal in single-domain ferromagnetic particles where losses must be minimized, in this paper, we study the mechanisms of dissipation used in cancer therapy by hyperthermia which requires the enhancement of energy losses. We show that for circularly polarized field, the loss energy per cycle is decreased by the anisotropy compared to the isotropic case when only dynamical effects are taken into account. Thus, in this case, in the low frequency limit, a better heating efficiency can be achieved for isotropic nanoparticles. The possible role of thermal fluctuations is also discussed. Results obtained are compared to experimental data.

arXiv comment9 pages, 8 figures, final version, accepted for publication in Phys. Rev. E

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Cited by in corpus (10)

• Magnetomechanical coupling and ferromagnetic resonance in magnetic nanoparticles
• Energy dissipation in single-domain ferromagnetic nanoparticles: Dynamical approach
• Power Loss for a Periodically Driven Ferromagnetic Nanoparticle in a Viscous Fluid: the Finite Anisotropy Aspects
• Energy dissipation of rigid dipoles in a viscous fluid under the action of a time-periodic field: the influence of thermal bath and dipole interaction
• Induced magnetization and power loss for a periodically driven system of ferromagnetic nanoparticles with randomly oriented easy axes
• Efficiency of magnetic hyperthermia in the presence of rotating and static fields
• Improved efficiency of heat generation in nonlinear dynamics of magnetic nanoparticles
• Theory of superlocalized magnetic nanoparticle hyperthermia: rotating versus oscillating fields
• Larmor precession and Debye relaxation of single-domain magnetic nanoparticles
• Drift of suspended single-domain nanoparticles in a harmonically oscillating gradient magnetic field