Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-10-08
J.Phys.:Condens.Matter 21 (2009) 124202
Physics
Condensed Matter
Other Condensed Matter
9 pages, 2 figures, final version, published in J. Phys.: Condens. Matter
Scientific paper
10.1088/0953-8984/21/12/124202
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 Neel relaxation on magnetic nanoparticles unable to move or rotate and compare the losses in linearly and circularly polarized field. 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.
de Chatel P. F.
Hakl J.
Meszaros Sz.
Nandori I.
Vad K.
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