How do you NEUTRALIZE a magnetic field from a permanent magnet?

I want to temporarily NEUTRALIZE (not demagnetize) a magnetic field from a permanent magnet. Basically I want the magnet to work normally until I want to turn it "off" or "neutralize" it. No electricity can be used to power it on, so that means no electromagnets. Electricity may be used to... show more I want to temporarily NEUTRALIZE (not demagnetize) a magnetic field from a permanent magnet.

Basically I want the magnet to work normally until I want to turn it "off" or "neutralize" it. No electricity can be used to power it on, so that means no electromagnets. Electricity may be used to power it off though.
Update: LoL I am not making a perpetual motion machine. I know enough about physics to know that's impossibe...well for now anyways heh.
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