Laser synthesis of magnetic iron oxide nanopowders

Magnetic iron oxide nanopowders are synthesized by the laser ablation of a target made of a coarse Fe2O3 powder. The geometric characteristics of the nanopowders and their yield are studied over a wide air pressure range ((1–34) × 104 Pa) in an evaporation chamber. The phase compositions of the nanopowders and the conditions under which their chemical composition is closest to magnetite Fe3O4 are determined. The specific saturation magnetization and the coercive force of some iron oxide nanoparticles are measured.