The most authoritative answer in 2024
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Amelia Brown——Studied at Princeton University, Lives in Princeton, NJ
There are typically four categories of permanent magnets:
neodymium iron boron (
NdFeB),
samarium cobalt (
SmCo),
alnico, and
ceramic or
ferrite magnets. This type of magnet is composed of rare earth magnetic material, and has a high coercive force.
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