Coplanar waveguide method for microwave and ferromagnetic resonance characterization of nanocarbon powders decorated with magnetic nanoparticles

摘要

This paper presents a broadband characterization method for nanocomposite powders made of magnetic nanoparticles grafted on graphene oxide sheets. A coplanar waveguide design is proposed as test cell for the nanopowders and a broadband microwave characterization of dielectric constant, conductivity, and permeability is performed even in presence of an external DC magnetic field. The experimental setup combined with the CPW test cell allows to successfully retrieve the ferromagnetic resonance characteristics of the magnetic nanoparticles as well as the electromagnetic parameters of the graphene nanoplatelets.