the.com/permalloy
the alloy so magnetically obedient it makes iron look stubborn and undisciplined.
recipeRoughly 80% nickel, 20% iron, almost no resistance to magnetism
telegraph heroWrapped Atlantic cables to speed transatlantic signals
shieldingMu-metal cousins guard sensors from stray magnetic fields
inventedBorn at Bell Labs around 1914
heat-sensitiveMagnetic gifts ruined by careless bending or stress