How to demagnetize a magnet By heating？

There are various ways to demagnetize a magnet, high temperature is one of them, this article will show you how to demagnetize a magnet by heating, including tools, steps, precautions.

High temperature heating neodymium magnets

Heating demagnetization magnet first need to determine what type of magnet, different magnets need different demagnetization temperature, we mainly focus on its Curie point parameters, like the commonly used NdFeB Curie temperature 310 ℃ - 400 ℃, ferrite Curie temperature 450 ℃ - 550 ℃. When heated to the Curie point temperature, its magnetic domains will become disordered, thus losing its original magnetic properties.

Equipment needed to heat demagnetized magnets;

Frequently used equipment includes high temperature electric furnaces, ovens, hot air guns, etc, Here it is necessary to ensure that the chosen heating equipment is capable of reaching the required temperature.

Heating demagnetizing magnet steps;

1, Place the magnet on a heat-resistant surface, such as a ceramic mat or heat-resistant plate, to ensure that the magnet will not move or roll off.

2, Slow heating: place the magnet on the heating tool and start heating slowly. Avoid direct flame contact with the magnet to avoid localized overheating.

3. Continue heating until the magnet's temperature reaches its Curie point, as mentioned above.

4, Once the magnet has reached its Curie point temperature, stop heating and allow the magnet to cool naturally to room temperature. During this process, the magnetic domains inside the magnet will be rearranged randomly, resulting in a loss of magnetism.

Important: Do not cool quickly (e.g. by placing in cold water) to avoid cracking of the material.

Caveats;

Try to choose a high-temperature oven, and if you choose a flamethrower you need to take safety measures, such as wearing heat-resistant gloves and goggles, to avoid burns or sparks flying.

The possibility of recovering the magnetism of a magnet after it has been demagnetized by heat;

If the magnet is heated below the Curie temperature but near the upper limit of its operating temperature, only temporary demagnetization results. Upon cooling, the magnetic domains may partially recover and the magnetism will be restored somewhat, but not completely. If the magnet is heated above the Curie temperature, the arrangement of the internal magnetic domains is completely destroyed and the magnetism does not recover on its own. In this case, the magnetism must be restored by a remagnetization process.

Past magnet demagnetization articles are organized;

Difference between demagnetized magnet and non-demagnetized magnet

Reason Of Neodymium Magnet Demagnetization

Neodymium magnets of high temperature resistance also will demagneti