Mumetal

Mumetal

[′myü‚med·əl]
(metallurgy)
An alloy of high magnetic permeability, containing 14% iron, 5% copper, 1.5% chromium, and the balance nickel.
References in periodicals archive ?
To achieve the acceptable levels, the engineering team covered the floor and all four walls with a specially created multilayer, three-substrate shield of welded aluminum plates and multiple layers of silicon-iron and mumetal sheets.