Well nuclear
You are correct about Cobalt. But building a simple shield for a pump at home hardly requires such a exclusive material when normal iron/steel does the job just as good/well.
And NO. Copper does not perform well when i comes to shielding low freqency magnetic interferance.
If you don't believe me just take a look in a handbook for engineering and notice the difference between ferromagnetic materials (Iron,Nicel,Cobalt) and nomal metals like ALU,Copper,etc.
The number to look for is called:
RELATIVE PERMEABILITY
The higher the better. Vaccum or air has the relative permeability=1.
And ferrous materials have a much higher number.
If i don't remember incorrectly coppers permeability is very close to 1 and therefore worthless as magnetic insulator.
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