Under what conditions will neodymium iron boron magnets demagnetize and demagnetize

Under normal circumstances, neodymium iron boron magnets never demagnetize, hence they are called permanent magnets. After 100 years of production and molding, it may only demagnetize by 2% -3%, which is equivalent to permanent magnet products in the field of motor horn 3C products widely used with neodymium iron boron magnets. However, neodymium iron boron magnets cannot be permanent magnets in extreme situations. Below, we summarize and summarize the situations where strong neodymium iron boron magnets can demagnetize and demagnetize.
1. High temperature demagnetization.
The working magnetic force of neodymium iron boron magnets is between 60 and 200 degrees Celsius. According to the working temperature, they can be classified into N, M, H, SH, UH and other grades. If the corresponding working temperature is exceeded, the neodymium iron boron magnet will experience demagnetization. When the magnet is in an environment below the working temperature but close to the maximum working temperature, the magnetic force of neodymium iron boron strong magnets may also decrease by about 2% -5%, but the magnetic force can recover correspondingly as the environment cools down. If the working temperature is exceeded, the magnetic force will undergo irreversible decay. Even after the environment cools down, the magnetic force cannot be restored. As the temperature increases, the rate of magnetic force decay will further accelerate. That is to say, the neodymium iron boron magnet will not immediately demagnetize as soon as the environment exceeds the maximum operating temperature, but will demagnetize at a certain speed. When a neodymium iron boron magnet completely demagnetizes (without any magnetism) at a certain temperature for a sufficient time, we call it the Curie temperature of the neodymium iron boron magnet, which is around 320-380 degrees Celsius.
2. Impact demagnetization
When we connect with customers, we will emphasize to them that when using neodymium iron boron magnets, they should be handled with care, and when assembling them together, they should be handled with mats and care. The reason is not only that neodymium iron boron magnets are brittle and fragile, with high magnetic force that can easily harm people, but also that severe impact of neodymium iron boron magnets can cause demagnetization. Even if the neodymium iron boron magnet does not shatter, its magnetic force will decrease to varying degrees due to the incorrect arrangement of molecules inside the magnet caused by severe impact.