Solvent Driven Magnetic Order Change in Graphene Decorated with alpha-Fe2O3 Nanoparticles

We present the studies of the structural and magnetic properties of nanocomposites based on graphene decorated with 25% alpha-Fe2O3 nanoparticles made with the use of either ethanol or acetone. We observed the presence of superparamagnetic blocking of the alpha-Fe2O3 nanoparticles at blocking temperature, T-B = 46.4 K or 159 K, for the samples made with the use of either ethanol or acetone, respectively. Our magnetization and magnetic susceptibility data revealed the presence of strong inter-particle interactions in our samples. The magnetic properties of our samples depend strongly on the type of solvent used for the sample preparation.