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Magnets
R are
earth magnets are strong permanent magnets. Rare earth magnets are made from
alloys of rare earth elements. Rare earth magnets are much stronger than alnico
or ferrite magnets, and the magnetic field produced by rare earth magnets can
exceed 1200 milliteslas. Ceramic and ferrite magnets produce a field of 50 to
100 milliteslas, and are not as strong as rare earth magnets. Because rare earth
magnets are very brittle, they are sometimes coated in nickel, to make them more
durable and protect them from chipping and breaking. Some common applications
for rare earth magnets can include, Audio speakers, fishing reel brakes, bicycle
dynamos and computer hard drives.
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