Magnetic field-assisted hydrothermal growth of chain-like nanostructure of magnetite

Chain-like nanostructures consisted of more than 10 magnetite nanoparticles with an average size of 80 nm were hydrothermally prepared at 200 °C under a 0.18 T external magnetic field. Magnetic measurement results revealed that the chain-like structure showed higher saturation magnetization Ms, remnant magnetization Mr, coercivity Hc and reduced magnetization Mr/Ms, compared with those of randomly distributed magnetite nanoparticles prepared without the induction of external magnetic field. Possible reasons responsible for the changes of the above magnetic parameters were tentatively discussed.