Preparation and characterization of bamboo charcoal/Ni0.5Zn0.5Fe2O4 composite with core-shell structure

Bamboo charcoal particles coated with Ni0.5Zn0.5Fe2O4, forming a core-shell structure, were synthesized by hydrothermal method. A structural characterization by FTIR, XRD and TEM proved that nanometer-sized Ni0.5Zn0.5Fe2O4 in the composite was responsible for the ferromagnetic behavior of the composite. Effects of the bamboo charcoal and temperature on the magnetic properties of bamboo charcoal/Ni0.5Zn0.5Fe2O4 composite have been studied by ferromagnetic resonance (FMR) technique. The measuring temperature was varied from 220 to 460 K. A clear evolution from ferromagnetic resonance to paramagnetic resonance (EPR) was observed as a function of temperature, which is related with the passage through the Curie point (∼ 380 K).