Demagnetization of a permanent magnet

[Harmony]

When we magnetize a ferromagnetic material, we provide an input of energy. Is it possible to demagnetize a magnet, and convert a fraction of the energy to usable work? (Of course, this is not a useful way to generate work, and some fraction of the input energy is lost)

 

[Vanadium 50]

When we magnetize a ferromagnetic material, we provide an input of energy.

Why do you say this?

 

[pallidin]

It would be true to say that energy is required to change a specific state of a system into another, specific state which does not currently exist.
Whether energy is to be "imparted" or "removed" or "dissipated" depends on the desired end-state.