High-frequency magnetic properties and micro-magnetic structure of Co2W-type ferrite with Bi2O3 addition for potential antenna applications

•The operating frequency of Co2W ferrite up to 2.2 GHz is achieved, which is superior to most current magnetic antenna substrates.•The magnetic domain structure of Co2W was observed by transmission electron microscopy with a Lorentz-Lens.•The relation between crystallographic behavior and magnetic domain structure of Co2W-type ferrites is unfolded.