How are magnets destroyed?

Answer 1

Ferromagnetism can be impaired by creating an opposing magnetic field. A wire coil placed around a magnet creates an electromagnetic field. If this is aligned in the opposite direction, it could eventually remove the intrinisic field of the permanent magnet.

In many cases, simply heating a magnet would likewise remove the magnetic field.

Use a degaussing coil (driven by AC, not DC). Gradually reduce the field strength either by reducing the AC current or slowly separating the coil and the object.

Answer 2

Magnets can lose their magnetic properties if exposed to high temperatures, leading to a loss of alignment of the magnetic domains within the material. Additionally, subjecting a magnet to strong external magnetic fields can also demagnetize it by rearranging the magnetic domains. Cutting or scratching a magnet can also disrupt its internal structure and result in a loss of magnetism.

Answer 3

There seem to be a couple of issues here. One is the physical destruction of the magnet while the other speaks to the demagnetization of the magnet. Let's take them one at a time.

Magnets can be demagnetized by heating them above their Curie temperature. High temperatures below this can also demagnetize a magnet if the magnet is kept hot for a sufficiently long time. We also know that exposing a magnet to an alternating magnetic field crated by, say, an alternating current, will demagnetize (degauss) them.

The physical destruction of a magnet can be accomplished in many ways. Cut it up, crush it up or whatever. But note that the bits of the magnet will still be little magnets unless something like what was suggested above happens.

Answer 4

Heat it over the flame, drop it many times or just hammer it.

Answer 5

By degaussing. Degaussing is a process of reducing the magnetism of a material by applying an opposite magnetic field.