For improved low - frequency magnetic shielding , a shield consisting of a high - permeability magnetic material ( e . g . , mumetal ) should be considered 要改善低频磁屏蔽的效果，就要考虑用高导磁率的磁性材料（即高导磁合金）来制作屏蔽体。
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However , mumetal is not especially easy to apply , and if it is saturated by an excessively strong field , it will no longer provide an advantage 虽然高导磁合金有诸多优点，但是这种材料用起来并不是很方便，如果受到强磁场作用而达到磁饱和的话，这种材料就不再具备任何优势了。
