Magnetism of a magnetic can be destroyed by?

1. Heating the magnet above its Curie temperature, causing the magnetic domains to become disordered and lose their alignment.
2. Subjecting the magnet to a strong external magnetic field in the opposite direction, causing the domains to realign in the opposite direction and cancel out the magnetism.
3. Physically damaging the magnet, such as dropping it or hitting it with a hammer, which can disrupt the alignment of the magnetic domains.
4. Exposing the magnet to corrosive substances or extreme environmental conditions, which can degrade the material and weaken its magnetic properties.