C) Nanocomposites for Medical Applications*

Carbon-coated ferromagnetic (Fe-Fe₃C) nanocomposites have been synthesized via solid-phase pyrolysis of metal-organic compaunds. Structure, morphology and magnetic characteristics of the nanocomposites were investigated by electron microscopy, X-ray diffraction, Raman spectroscopy, STEM-TEM images, EDX line-scan profiles and magnetometry. The magnetic characteristics such as saturation magnetization, coercivity and heating saturation as well as the specific absorption rate (SAR) make these materials attractive for magnetic hyperthermia applications. Hysteresis loop of the (Fe-Fe₃C)@C nanocomposites is of special interest as it shows almost square-like behaviour, where M_r/M(200 Oe) = 0.75.The limitation of the magnetic field amplitude and - frequency (H x f) ≤ 10.625x10⁶ Oe/s makes this factor important that provids a high energy absorbtion even in case of low magnetic fields.