Magnetic particle hyperthermia: Néel relaxation in magnetic nanoparticles under circularly polarized field

P. F. De Châtel, I. Nándori, J. Hakl, S. Mészáros, K. Vad

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The mechanism of magnetization reversal in single-domain ferromagnetic particles is of interest in many applications, in most of which losses must be minimized. In cancer therapy by hyperthermia the opposite requirement prevails: the specific loss power should be maximized. Of the mechanisms of dissipation, here we study the effect of Néel relaxation on magnetic nanoparticles unable to move or rotate and compare the losses in linearly and circularly polarized fields. We present exact analytical solutions of the Landau-Lifshitz equation as derived from the Gilbert equation and use the calculated time-dependent magnetizations to find the energy loss per cycle. In frequencies lower than the Larmor frequency, linear polarization is found to be the better source of heat power, at high frequencies (beyond the Larmor frequency) circular polarization is preferable.

Original languageEnglish
Article number124202
JournalJournal of Physics Condensed Matter
Volume21
Issue number12
DOIs
Publication statusPublished - May 11 2009

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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