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Is the NdFeb Magnet Permanent Magnetic?

April 17,2023

When you purchase neodymium magnets, do you have a doubt that the magnetism of neodymium magnets is permanent? Whether the suction will not be as time goes by.

Let's take a look at the following questions.


1.Do neodymium magnets weaken over time?

Yes, a neodymium magnet does weaken over time, but depending on the effects on it, it will basically remain magnetic forever. Permanent magnets will retain their magnetism for many years if kept and used under optimal working conditions. It is estimated that neodymium magnets lose only about 5% of their magnetism every 100 years.


Therefore, the service life of the magnet can be up to several centuries without being affected by any external factors. High temperature, stray magnetic fields, current, radiation, humidity, and damage can demagnetize a magnet, but it usually lasts for a long time depending on the type of magnet.


Optimal operating conditions include not exposing the magnets to temperatures above their maximum operating temperature, protecting the magnets from corrosion, and finally not exposing them to strong demagnetization fields.

2.How long will neodymium magnets last?

Neodymium magnets are permanent magnets that lose a small fraction of their performance every 100 years if kept under optimal working conditions.

There are two factors that can shorten the service life of a magnet.

1.High Temperature

If the temperature of the magnet exceeds the maximum operating temperature, the magnet will lose its magnetism and cannot be recovered after cooling. The N42 neodymium magnet has a maximum operating temperature of 80°C.

Samarium cobalt magnets are not as strong as neodymium magnets, but they do operate at much higher temperatures, up to 350°C.



If the coating on the magnet is damaged and water gets inside, the magnet will rust, which will again cause the magnetic properties to decrease.

Samarium cobalt magnets and ferrite magnets are both resistant to corrosion, but not as strong as neodymium magnets.


In summary, Ndfeb belongs to rare earth permanent magnet, is a permanent magnet, in a specific environment, its magnetic properties will exist forever.

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