Synthesis and complex permeability of Co/SiO2 nanocomposites

In this paper, a simple sol-gel combined hydrogen reduction synthesis of Co/SiO2 nanocomposites was reported. The specific magnetization of the sample can be as high as 146.34 emu/g even including silica, which is a non-magnetic material. The real part μ′ of the permeability for Co/SiO2 nanocomposites is almost independent of frequency up to at least 10 MHz, at the same time, the loss of μ″ is very small. Our method provides a promising route to achieve soft magnetic material with good magnetic properties, especially in the high-frequency range.