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Long term magnetic repulsion with permenant magnets?

  1. May 10, 2012 #1
    i have a set of neodynium magnets which i am using for a magnetic levitation project... will the constant exposure to an opposing magnetic field weaken the magnets over time? are 'permenant' magnets really permenant?
  2. jcsd
  3. May 11, 2012 #2

    Meir Achuz

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    The reverse magnetic field can tend to demagnetize. The extent depends on the material of the magnet and temperature.
  4. May 12, 2012 #3
    the coercivity of neodymium is 1.2 , which is supposed to be greater than most materials... this means that , in the same conditions, neodymium would keep its magnetic strength for longer than most materials, but not indefinitely?
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