Magnetic particle hyperthermia

Power losses under circularly polarized field in anisotropic nanoparticles

I. Nándori, J. Rácz

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The deterministic Landau-Lifshitz-Gilbert equation has been used to investigate the nonlinear dynamics of magnetization and the specific power loss in magnetic nanoparticles with uniaxial anisotropy driven by a rotating magnetic field, generalizing the results obtained for the isotropic case found by P. F. de Châtel, I. Nándori, J. Hakl, S. Mészáros, and K. Vad. 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 energy loss 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.

Original languageEnglish
Article number061404
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume86
Issue number6
DOIs
Publication statusPublished - Dec 11 2012

Fingerprint

Hyperthermia
hyperthermia
power loss
Nanoparticles
energy dissipation
nanoparticles
magnetization
anisotropy
Magnetization
Anisotropy
therapy
dissipation
cancer
low frequencies
Magnetic Nanoparticles
Landau-Lifshitz Equation
cycles
heating
augmentation
Reversal

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Statistical and Nonlinear Physics
  • Statistics and Probability

Cite this

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