what and why is a magnetic keeper used?
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A magnet keeper, also known historically as an armature, is a ferromagnetic bar made from soft iron or steel, which is placed across the poles of a permanent magnet to help preserve the strength of the magnet by completing the magnetic circuit; it is important for magnets that have a low magnetic coercivity, such as alnico magnets.
Keepers also have a useful safety function, as they stop external metal being attracted to the magnet.
Most magnets do not need a keeper, only those with low coercivity, meaning that they are easily susceptible to stray fields.
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