How to demagnetize a magnet?

A magnet is an object that has a magnetic field. The word magnet comes from the Greek "magnítis líthos" (μαγνήτης λίθος), which means "magnesian stone". Magnesia is an area in Greece (Now Manisa, Turkey ) where deposits of magnetite have been discovered since antiquity.

How to demagnetize materials

Permanent magnets can be demagnetized in the following ways:

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• Heat. Heating a magnet past its Curie point will destroy the long range ordering.
• Contact. Stroking one magnet with another in random fashion will demagnetize the magnet being stroked, in some cases; some materials have a very high coercive field and cannot be demagnetized with other permanent magnets.
• Hammering and/or Jarring. Such activity will destroy the long range ordering within the magnet.
• Being placed in a solenoid which has an alternating current being passed through it. The alternating current will disrupt the long range ordering, in much the same way that direct current can cause ordering.