Ferrite bead vs Inductor
The ferrite bead is lossy at high frequencies, i.e. low Q or resistive. The high frequency energy are absorbed and dissipated as heat. A pure inductor is non-lossy and stores energy. While a real inductor has some inevitable resistive element, it absorbs energy equally at all frequencies.
Mu-Metal
Mu-metal is high permeability material; it achieves the magnetic field shielding by redirecting magnetic field lines.
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