[whatshisface]

Although high permeability materials can route field lines around things to a certain extent, you can't get the kind of total magnetic shielding you'd want to say, protect a floppy disk from a strong magnet, without superconductors.

[metadat]

Why is this?

[whatshisface]

Conductors shield against electric fields and also catch EM radiation because it involves both E and M fields, but magnetic shielding relies on something analogous to electric polarization and consequently is more difficult.