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Additional recommended knowledge
The high permeability makes mu-metal very effective at screening static or low-frequency magnetic fields, which cannot be attenuated by other methods.
Mu metal requires special heat treatment — annealing in hydrogen atmosphere, which reportedly increases the magnetic permeability about 40 times. The annealing alters the material's crystal structure, aligning the grains and removing some impurities, especially carbon. Mechanical treatment may disrupt the material's grain alignment, leading to drop of permeability in the affected areas, which can be restored by repeating of the hydrogen annealing step.
Uses and properties
Mu-metal is used to shield equipment from magnetic fields. For example:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Mu-metal". A list of authors is available in Wikipedia.|