PURPOSE: To enhance the wave absorbing characteristics by using a granular barium ferrite powder which is produced by the glass crystallization method in which the grain diameter and the magnetic characteristics can easily be controlled.

CONSTITUTION: The basic component of barium ferrite, the glass forming component, and the substitution component for reducing the coercive force are mixed and melted. An amorphous substance obtained by adding an appropriate amount of barium ferrite powder into this melt and allowing it to be melted and thereafter rapidly cooling the molten material is heat-treated to be crystallized, generating sintered barium ferrite. A granular barium ferrite powder obtained by finely grinding this sintered substance, thereafter treating it with dilute acid and melting and removing the glass forming component is mixed and dispersed into a polymeric material such as polypropylene. Then, a wide-band wave absorption from a low-frequency region to a high-frequency region becomes available. By this, the wave absorbing characteristics is enhanced.