Magnetic properties of iron–carbon nanocomposites obtained by laser pyrolysis in specific configurations

New nanometric systems were produced by using specific parameters of the laser pyrolysis process. Relevant results related to the magnetic behavior of the samples were obtained via SQUID magnetometry and Mössbauer spectroscopy, the data being corroborated with those previously obtained from X-ray diffraction, transmission electron microscopy and energy dispersive X-ray spectroscopy. The formed nanocomposites contain iron carbides, iron oxides and metallic iron nanoparticles which relative content and average size depend strongly on experimental specific parameters of the pyrolysis process. The magnetic properties and the local interaction mechanisms were explained by adequate magnetic relaxation and static models.

► Complex nanocomposites obtained by laser pyrolysis.
► Full characterization of the magnetic phase composition.
► Following magnetic relaxation of each nanocomponent in the composite.
► Manipulation of processing parameters for final products of desired properties.