Research on Microwave Absorption Properties of FeCo/Graphite Nanocomposite

Abstract

FeCo/graphite oxide composites were firstly prepared by absorbing Fe and Co into the layers of graphite oxide based on absorption property of graphite oxide. And then FeCo/graphite nanocomposites were synthesized by reducing the FeCo/graphite oxide compounds with H2. The crystal structure, morphology and magnetic properties were characterized by XRD, SEM and magnetic loop analysis, and the microwave absorption properties, caused by content variation of FeCo alloy, was investigated. Results indicated that the FeCo/graphite nanocomposite was two-phase material composed by graphite and nano FeCo particles. With diameter ranging from 30 nm to 150 nm, the FeCo particles dispersed both on the surface of and between the graphite layers, which made the FeCo/graphite nanocomposite a typical soft magnetic material. With the FeCo alloy content decrease, the saturation magnetization and magnetic loss increased but the dielectric loss decreased. With proper FeCo alloy content, the synergistic effect of dielectric loss and magnetic loss could lead to the FeCo/graphite nanocomposite displaying good microwave absorption property.