nanoparticles with core-shell structures coated by carbon matrix*

Here we are focused on investigation of magnetic and structural properties of synthesized nanocomposites with iron nanoparticles as effective heat mediators with high thermal energy transfer efficiency suitable for use for magnetic hyperthermia. These nanoparticles have “core-shell” structure, in which the core has a high magnetic moment (such as Fe), and the shell consists of a biocompatible material (e.g. iron oxide or carbide). Complex investigations of structural and magnetic properties of these materials are obtained using X-ray diffraction (XRD), Raman spectroscopy, magnetometry, electron paramagnetic and ferromagnetic resonances (EPR, FMR). The measured magnetization of magnetic saturation and coercivity as well as the specific absorption rate (SAR) show that these materials attractive for magnetic hyperthermia applications. Hysteresis loop of the (Fe-Fe₃C)@C nanocomposites is of special interest as it shows almost square behaviour, where M_r/M(200 Oe) = 0.75.