Heat deposition in iron oxide and iron nanoparticles for localized hyperthermia

The structural and magnetic properties of four different iron oxide and iron nanoparticles were investigated with respect to the possible application for magnetic hyperthermia treatments. The specific power absorption rates were measured in alternating magnetic fields of 75–150 Oe at frequencies of 10–300 kHz. The heating behavior is discussed in relation to the magnetic behavior of the nanoparticles. It was found that the largest specific absorption rate of $2.8\mathrm{W}∕\mathrm{g}$ occurred for the 20–30-nm-diam ${\mathrm{Fe}}_2{\mathrm{O}}_3$ nanoparticles.