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Energy in Hysteresis

  1. Apr 11, 2004 #1
    I would like to know how can one show that the area of a B-H curve, ie hysteresis loop, denotes the energy dissipated per unit volume during magnetising cycle.
    I can't find this anywhere and need it urgently.
    Thanks for any help.

  2. jcsd
  3. Apr 12, 2004 #2


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    Homework Helper

    Consider strictly magnetic energy. You can give the energy density as ~|B|2. Then, you can relate B = μ0 ( H + M ), where H is the magnetic field vector (abscissa) and M is the magnetization vector (ordinate). Finally, you can use this to get M = f(H) and piece-wise integrate over the loop to get the energy density.
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