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Magnetising a hard magnetic material

  1. Jul 17, 2005 #1
    Is it possible to magnetize steel (hard magnetic material) with an ac source?
  2. jcsd
  3. Jul 17, 2005 #2


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    I'm quite certain it can not. An AC current makes an oscillating B-field. The time-averaged value of the B-field is therefore, zero. Hence, no magnetization greater than the remanence can be achieved, and depending on the frequency (keep in mind that the magnetization of a ferromagnet is a highly non-equilibrium process and time constants for changes in magnetization can be of the order of seconds, even at normal temperatures) it could be significantly smaller.
  4. Jul 18, 2005 #3
    This sounds like a very dangerous home-made experiment waiting to happen :biggrin:
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