FeCo soft magnetic, electrically insulated nanopowders

The concept of more electrical aircraft architecture requires new magnetic materials, with improved magnetic and electrical properties. The paper investigates the soft magnetic materials based on FeCo/Al2O3 core-shell nanoparticles, synthesized by sol-gel technique. These nanomaterials combines the high saturation magnetisation of FeCo compound with the increased resistivity of Al2O3 and allow the decreasing of time-dependent magnetic losses for the bulk sized components, compared with the currently available Fe-Si alloys, used as metallic punched sheets for the building of the magnetic cores in electrical machines. The main physical characteristics of the FeCo/Al2O3 prepared nanomaterials are: saturation magnetisation in the range of 136-213 emu/g, coercivity around 24.5 kA/m (320 Oe) and electrical resistivities of order of 10(14) Omega.m.