Feξ–V2O5 nano-composites: Room temperature magneto-optical and radar absorption properties

Room temperature magneto-optical and radar absorption measurements were carried out on Feξ–V2O5 nano-composites prepared by RF co-sputtering. The relationship between the Fe atomic content and the state of the matrix precursor as well as the metal nano-particles’ size are discussed with emphasis on the interfacial oxidation of the Fe nano-particles. The magneto-optical and radar absorption responses were found to be effective above the Fe nano-particles percolation threshold ξC. Using three different complementary techniques, this critical value was found to be about 23% atomic. From absorption viewpoint, these Feξ–V2O5 nano-composites could be adequate radar absorbers at the specific radar frequency of 9.45 GHz. Below the critical atomic concentration value of 23%, the radar absorption is weak and relatively broad.