permanent magnet

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permanent magnet

An MRI term for a magnet design that uses blocks of ferromagnetic materials (permanent magnets) to generate a magnetic field between the magnet’s poles.

Pros
No need for extra electrical power or cooling, reduced fringe field effect and no missile effect due to iron composition of magnet.

Cons
Weight considerations limit permanent magnets to maximum field strengths of 0.3T or less.
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