Round magnets not only have requirements for the working environment but also for the indoor environment. Their magnetic properties greatly surpass those of ferrite magnets, aluminum nickel cobalt, and neodymium cobalt magnets. Neodymium iron boron magnets can attract 640 times their own weight, hence often being referred to as strong magnets by outsiders. Round magnets can be magnetized and demagnetized as they inherently possess or may have some magnetic properties. What are some reasons for the demagnetization of strong magnets?

However, in everyday practice, we still opt for the demagnetization by交流退磁法 due to its superior effectiveness and higher demagnetization efficiency compared to high-temperature and vibration demagnetization methods. It is the most commonly chosen method in industrial production today.

We can formulate specific degaussing methods based on the varying applications of magnets.

High-Temperature Demagnetization Method: The primary operation of the high-temperature demagnetization method is to immerse the magnet into a high-temperature furnace for heating. After undergoing high-temperature treatment, the magnetism of the magnet is removed. However, during the heating process, the direct effect of the high temperature can cause a significant change in the internal structure of the magnet.

Therefore, this method of degaussing is generally used for magnets that are to be invalidated or recalled. The operation is quite simple: the magnet is subjected to strong and violent vibrations. After the vibration process, the internal structure of the magnet is altered, and then the magnet's physical properties are changed. However, this method is usually not very effective for degaussing, as it can only partially demagnetize and is only temporarily applicable. This method involves placing the magnet in a space that can generate an alternating magnetic field. After being disturbed by the alternating magnetic field, the internal structure of the magnet is disrupted, thereby achieving demagnetization. This is a commonly used method for degaussing.