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Neodymium magnets (NdFeB) are composed of neodymium, iron, boron
and a few transition metals.
Neodymium (NdFeB) magnets are the most powerful, strongest Rare
Earth magnets available today.
Neodymium (NdFeB) magnets possess high energy ranging from 8 MGOe
to 48MGOe.
Neodymium (NdFeB) magnets are the second most difficult material
to demagnetize. They have high coercive forces of 12KOe - 25KOe.
Neodymium (NdFeB) magnets are easily corroded by moisture and should
be coated, i.e. Ni plated.
Neodymium (NdFeB) magnets are less brittle than SmCo and SrFeO (Ceramic),
but should not be used structurally.
Neodymium (NdFeB) magnets offer the most magnetism for the dollar;
for the size and for the weight.
Samarium cobalt magnets (SmCo) are composed of samarium, cobalt
and iron.
SmCo magnets are the second most powerful rare earth magnets available
today.
SmCo magnets possess high energy ranging commonly from 18 MGOe to
28 MGOe.
SmCo magnets are the most difficult to demagnetize.
SmCo magnets are the most resistant to heat losses.
SmCo magnets are resistant to corrosion by moisture but should be
coated.
SmCo magnets offer the least magnetism for the dollar, due to the
Cobalt cost.
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