# Energy in Hysteresis

1. Apr 11, 2004

### janrain

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.

Kavita

2. Apr 12, 2004

### turin

Consider strictly magnetic energy. You can give the energy density as ~|B|2. Then, you can relate B = &mu;0 ( 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.