Specific absorption rate parameter model in magnetic hyperthermia

摘要

This study presents the results of specific absorption rate (SAR) analysis of polydisperse water based ferrofluid with median Fe₃O₄ particle diameter of 15.2nm. The time dependent temperatures were measured in alternating magnetic field of various frequencies and at fixed amplitude. On the base of the corrected slope method maximum SARs were acquired for the sample. Next, the linear response theory (LRT) with magnetic field dependent relaxation times was employed in order to calculate SAR distribution in the sample. Taking into consideration the polydisperse character of the ferrofluid the Zemann energy condition was used in order to delimit the area where LRT is valid. For the larger single-domain particles the Stoner-Wohlfarth based theory was applied.