How you can demagnetize materials?

Answer 1

A magnet has magnetic properties because the dipoles of the atoms are lined up in a single direction. To demagnetize it, you must scramble the dipoles out of alignment. First, heat the magnet past the Curie point (the temperature at which it loses its magnetic properties until cooled). Strike it on the ends of the magnet with a hammer. When cooled, it will no longer be magnetized.

Answer 2

An electromagnet is, by definition, magnetic when current flows in the coil. You demagnetize it by shutting off the current.

A "permanent" magnet is demagnetized by violently disturbing the material's microscopic magnetic domains, for example by heating it intensely, hammering it, dropping it, or placing it in the magnetic field of a strong alternating current.

Answer 3

In a magnet, the alignment of the magnetic fields produced by the magnetic atoms (iron, cobalt, etc) in the magnet is what gives it its magnetic properties. Anything that can randomise the spacial orientation of these magnetic atoms will demagnetise the magnet. Some examples of ways to do this are heating the magnet above its Curie temperature or striking it repeatedly with sufficient force (e.g. hitting it with a hammer).

Answer 4

1. thermal - heat the magnet above the Curie Point temperature for the material it is made of
2. electromagnetic - use a degaussing coil (a coil driven by AC to keep reversing the field of the magnet), slowly remove the coil from the vicinity of the magnet before turning the power off to the coil

Answer 5

Permanent magnets can be de-magnetised by heating them.

Or by inducing a magnet with opposite poles.

With electromagnets, turn off the (electric) current.

Answer 6

Heating and hammering will demagnetize .