Abstract: The polyxol method is used to prepare the fine metallic and bimetallic alloy powders. XRD and TEM analysis show that the fine Co and Ni metallic powders have a fcc structure and Co_xNi_1-x. powder has a solid solution or a mixed fcc phase, and all of these powders have a nearly spherical shape with grain size being about 50nm. The specific saturation magnetisation σ_s increases (from σ_s=18.8 to 128. 8 Am²/kg) and the coercivity H_c decreases (from H_c=14000 to 7520 A/m) as the mole fraction of cobalt x varies from 0 to 1. The HP8510B is used to measure the dynamic permeability of metalepoxy resin composite material within the frequency range of 8. 20~12. 40 GHz. The dependence of static and dynamic magnetic properties upon mole fraction x is also discussed.

Key words: nanometallic magnetism powder, static and dynamic magnetic properties, specific saturation magnetisation, coercivity, dynamic permeadility, polyxol method