How exactly does temperature affect NdFeB magnets?

NdFeB magnets are known for their superior magnetic strength. They are a rare earth magnet, made from an alloy of neodymium. Although there are other types of rare earth magnets, such as samarium cobalt magnets, neodymium iron boron magnets are the most powerful permanent magnets in commercial use at this stage.

A typical neodymium magnet is about 10 times stronger than conventional ferrite or ferrite. Because they are so strong, they are often used in commercial applications. However, like all magnets, NdFeB magnets are affected by temperature. If you plan to purchase neodymium magnets, you should keep them away from all heat sources.

How exactly does temperature affect neodymium magnets?

NdFeB magnets weaken when heated. They don't necessarily lose their ability to generate magnetic fields. However, NdFeB magnets generally produce a weaker magnetic field when heated.

Exposure to temperatures of 80 degrees Celsius or higher will weaken neodymium magnets. NdFeB magnets are characterized by atoms with north and south poles aligned with each other. Heat causes these atoms to shift positions. Because the atoms are no longer aligned, the magnetic performance of the NdFeB magnet will be reduced.

To maintain their strength, you should keep neodymium magnets away from all sources of heat. Heat sources include furnaces, torches, ovens, etc. Even short-term exposure to heat can weaken NdFeB magnets.

Does low temperature affect NdFeB magnets?

Low temperatures generally do not weaken or otherwise damage neodymium magnets. In fact, it can help neodymium magnets regain some of their lost strength. If a neodymium magnet has been weakened by heat, low temperatures may restore it to its original shape.

Low temperatures can rearrange the atoms inside neodymium magnets. Exposure to high temperatures can cause the atoms to lose their arrangement. Conversely, exposure to cold rearranged the atoms, restoring the lost strength of the neodymium magnets. Neodymium magnets become stronger as the atoms move back into their original alignment. The low temperature would essentially reverse the effects of heat exposure by restoring the lost strength of the neodymium magnets.

It is important to note that cryogenics will not fix all cases of heat weakened neodymium magnets. Neodymium magnets may not regain their lost strength when exposed to excessive temperatures. Cold temperatures will not restore the magnet's lost strength.

In summary

When using neodymium magnets, attention should be paid to nearby heat sources. Neodymium magnets can withstand some temperature fluctuations, but exposure to temperatures of 80 degrees Celsius or higher can weaken them.