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Rare earth magnets

  1. Jan 31, 2010 #1
    Can someone explain why a rare earth magnet is so much more powerful than the lesser magnet? And why is it called rare earth? Thank you
     
  2. jcsd
  3. Jan 31, 2010 #2

    Andy Resnick

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    I'm not sure the reason why certain compounds have such high coercivities, but they are called 'rare earth' because the elements (Nd, Sm, Pr, etc) are in the Lanthanide series.
     
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