Reversible Permanent Magnet created at MIT

[Omega_0]

Now the important question :

Does it take less energy to switch it, than what can be convertible into useful work, e.g by placing coils around it, while it is being switched ?

[ChileanOne]

Now the important question :

Does it take less energy to switch it, than what can be convertible into useful work, e.g by placing coils around it, while it is being switched ?

That's the million dollar answer, and seems not easy to come by.