I‘m doing a small experiment with my son for a science project and we are looking for magnetic resistance in typical household objects. So far we have found nothing. Glass. plastic, paper, water, nonferrous metals, wood, you name it. Of course it depends on the thickness of the material and the strength of the magnet. We are working with small neodymium magnets.
As I suspected. Nothing can really stop a magnetic field. It's to do with the nature of magnetism. The fact that there are no magnetic monopoles, the field must end somewhere. Lead apparently has no more effect than air. You can try to concentrate, or 'move' the magnetic fields into another object to shield it in someway.
There exist several nickle-iron (plus some other impurities, like molybdene) alloys that can do that: mu-metal, permalloy, supermalloy, nilomag, sanbold. Mu-metal is often used for shielding of magnetic fields in household appliances.
