China Neodymium And Ferrite Magnets Manufacturer & Supplier 
My magnet doesn't seem to be as strong as it used to be. What's going on? Today we will introduce to you the main demagnetization reason of strong neodymium magnets.
1、High temperature:
Ndfeb strong magnets is sensitive to temperature, when the temperature exceeds its Curie temperature, the magnet will lose magnetism. The Curie temperature of Ndfeb is usually between about 300°C and 400°C, depending on the composition of the material. Therefore, high temperatures may cause the magnet to demagnetize.
At a working temperature not exceeding 80 degrees Celsius: N grade neodymium iron boron high-temperature resistant magnets can be selected.
Between 80-100 degrees: M-grade neodymium iron boron high-temperature resistant magnets can be selected.
Between 100 ° C and 120 ° C: H-grade neodymium iron boron high-temperature resistant magnets can be selected.
Between 120 ° C and 150 ° C: SH grade neodymium iron boron high-temperature resistant magnets can be selected.
Between 150 ° C and 180 ° C: UH grade neodymium iron boron high-temperature resistant magnets can be selected.
Between 180 ~ 200 degrees: EH grade neodymium iron boron high-temperature resistant magnets can be selected.
Between 200 ° C and 230 ° C: AH grade neodymium iron boron high-temperature resistant magnets can be selected.
2、External magnetic field:
Under the action of strong magnetic field, NdFeb magnets may be demagnetized. When a strong magnetic field is applied to a magnet, the magnetic microregions (domains) within it may rearrange or flip over, causing the entire magnet to demagnetize.
3、Vibration and shock:
Neodymium iron boron magnets are also sensitive to vibration and shock. When subjected to severe vibration or impact, the magnetic domain structure inside the magnet may be disrupted, leading to demagnetization.
4、Long term use:
Neodymium rare earth magnets may gradually demagnetize during prolonged use, especially in high temperature and high stress environments. This is due to changes in the magnetic domain structure of the material itself or the movement of the magnetic domain walls, resulting in the magnet gradually losing its magnetism.
5、High humidity and corrosive environments:
Neodymium iron boron magnets are also sensitive to humidity and corrosive environments. When exposed to high humidity or corrosive media, the surface of the magnet may undergo corrosion or oxidation, leading to demagnetization.
In order to avoid or reduce the demagnetization of ndFeb magnet, the following measures can be taken: control the working temperature to avoid exceeding the Curie temperature; Avoid prolonged exposure to strong magnetic fields; Avoid violent vibration and impact; Maintain a dry and corrosion-free environment; Properly handle and store magnets.
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