A strong alternating and damped magnetic field would demagnetize a Nd magnet. It needs like 3T hence can't use a permanent magnet nor a magnetic circuit. The spool that creates this induction consumes several MW which can be provided by the discharge of a really big capacitor, a fraction of m3; the oscillating current suggests a nonpolarized capacitor which is even bulkier.
Thanks Enthalpy, being a complete beginner at this what is 3T? what type of capacitor would demagnatize the Nd magnets?
Thanks