Converting a magnet to a non-magnet is called demagnetisation. Magnets are made from magnetic metals – iron, nickel and cobalt. These are the only pure metals that can be turned into a magnet.

5.2.2 Bar magnet as an equivalent solenoid Cutting ... Such materials form permanent magnets to be used among other things as a compass needle. On the other hand, there is a class of ferromagnetic ...