physics question #856

Charles Kern, a 60 year old male from Detroit Lakes, Michigan asks on July 17, 2002,

Q:

Is there a high permeability magnetic shield that does not have iron in it?
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the answer

James Livingston answered on July 23, 2002, A:

Most high permeability magnetic shields indeed contain iron, although some are nickel-rich alloys that contain only about 30% iron. If it's necessary for the shield to be completely iron-free, the best bet may be cobalt-rich amorphous alloys, even though they are rather expensive.

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