IMPROVED LONGITUDINAL MAGNETIC SHIELDING BY AN AMORPHOUS FE-SI STEEL COMPOSITE PANEL

An improved magnetic shielding using the magnetic shaking technique wi th a planar mesh coil is applied to develop a composite shielding pane l of Fe-based amorphous sheet and Si steel sheet. The mesh coil, sandw iched by the two ferromagnetic materials, makes a two-dimensional shak ing field that enhances magnetic shielding. The composite panel anneal ed without field shows exceedingly high longitudinal shielding effecti veness. Fine and circular magnetic domains of amorphous Fe-based ribbo ns contribute to the magnetic shielding effectiveness for alternating fields at high frequencies.