Mu-metal
Mu-metal
is a
nickel
-
iron
alloy
(77% nickel, 15% iron, plus
copper
and
molybdenum
) that is very efficient for screening
magnetic fields
. It is used to shield vacuum chambers for experiments with low-energy
electrons
, to shield
magnetic resonance imaging
equipment, and to shield the
magnetometers
used in
magnetoencephalography
and
magnetocardiography
. The name of the material refers to the Greek letter
μ
, which is the symbol for magnetic
permeability
. Mu-metal has a high value of μ.
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