or particles. Coatings tend to suffer from their poor wear or scratch resistance.
A secondary mechanism of EMI shielding is usually absorp¬tion. For significant absorption of the radiation by the shield, the shield should have electric and/or magnetic dipoles, which in¬teract with the electromagnetic fields in the radiation, The elec¬tric dipoles may be provided by BaTiC>3 or other materials having a high value of the dielectric constant. The magnetic dipoles may be provided by Fe304 or other materials having a high value of the magnetic permeability,1101 which may be enhanced by reduc¬ing the number of magnetic domain walls through the use of a multilayer of magnetic films.126'271