Can strong neodymium magnets be remagnetized after being demagnetized at high temperature?

The application of strong magnetic NdFeB involves all walks of life. Different application fields and products have different requirements for magnets, such as high temperature resistance, salt spray resistance, tolerance, etc. Some purchasers may not tell the magnet manufacturer about the need for high temperature resistance due to lack of understanding of magnets, or they may directly see the specifications suitable for them on the Internet, and the price is acceptable, so they start to buy. However, it is easy to cause demagnetization during use, or the magnet does not need to be magnetized, but the magnet manufacturer is not clearly explained, resulting in magnetization. Generally, magnets are magnetized by default when delivered.

So can strong magnetic neodymium magnets be magnetized again after high temperature demagnetization?

The answer is that they can be magnetized, but they cannot reach the original level, that is, the inherent magnetic properties have decreased and cannot be fully restored, so it is necessary for you to understand the working temperature of various magnets.

Disadvantages of high temperature demagnetization and re-magnetization of NdFeB:

Magnetic loss: After high temperature treatment, the microstructure inside the magnet may have changed, resulting in partial or complete loss of magnetism. Even if it is re-magnetized, its magnetism may not be fully restored to its previous level.

Structural changes: High temperatures may cause changes in the lattice structure inside the magnet, making it more fragile or susceptible to cracking from external impact.

Cost and efficiency: The remagnetization process may require additional time and resources, and may not fully restore the original magnetism.