Mu-metal is a nickel-iron alloy, composed of approximately 77% nickel, 16% iron, 5% copper and 2% chromium or molybdenum, that is notable for its high magnetic permeability. The high permeability makes mu-metal useful for shielding against static or low-frequency magnetic fields. The name came from the Greek letter mu (μ) which represents permeab...
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http://en.wikipedia.org/wiki/Mu-metal
Mu-metal is a nickel-iron alloy characterised by its high permeability at low field strengths and its small hysterisis losses.
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http://www.probertencyclopaedia.com/browse/GM.HTM
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