Why will neodymium magnets lose their magnetism?

As an important magnetic material, neodymium magnets play an important role in modern technology and industry. However,industrial neodymium magnets will lose their magnetism under some specific conditions, which brings certain problems to their application and use. We will analyze from the perspectives of external magnetic field, chemical corrosion and oxidation, magnetic domain inversion, hysteresis and aging phenomena, and propose corresponding preventive measures. By enhancing the understanding of the performance changes of neodymium magnets, we can better protect and extend the service life of neodymium magnets, and promote their applications in various fields.

Ⅰ.So, why do neodymium magnets lose their magnetism?

One possible reason is the influence of external magnetic field.

When a neodymium magnet is subjected to a strong external magnetic field, magnetic pairs may occur, resulting in loss of its magnetism. In addition, high temperature may also cause magnetic loss of neodymium magnets, because high temperature will destroy the alignment of its internal magnetic domains.

Another reason is the chemical corrosion and oxidation of neodymium magnets.

Long-term exposure to humid environment, neodymium magnets may undergo oxidation reaction, resulting in the formation of an oxide layer on the surface, which will affect its magnetic properties.

In addition, domain inversion, hysteresis and aging phenomena can also cause small neodymium disc magnets to lose their magnetism. Magnetic domain inversion refers to the rearrangement of magnetic domains, resulting in a decrease in magnetic properties. Hysteresis refers to the residual magnetism of neodymium magnets under the action of an external magnetic field, while aging refers to the gradual weakening of magnetism over time.

Ⅱ.How to avoid or slow down the loss of magnetism of Neodymium magnet

A. Reasonable environment and temperature control

1. Preventive measures in high-temperature environments

2. Mitigation methods for vibration and impact

3. Protective measures against light and radiation

B. Preventing chemical corrosion and oxidation

1. Appropriate coating materials should be selected

2. The importance of moisture and dust prevention measures

C. Prolong the service life of Neodymium magnet

1. Reasonably design the magnetic circuit and electromagnetic system

2. Regular maintenance and inspection

Ⅲ.Care and usage precautions of neodymium magnets.

The following is to emphasize the importance of maintenance and use precautions:

1. Extended service life: Correct maintenance and use methods can prolong the service life of neodymium magnets. For example, avoid exposure to high temperature or humidity, and perform regular cleaning and maintenance.

2. Guaranteed magnetic properties: Correct maintenance methods can maintain the magnetic properties of neodymium magnets. Regular inspection and avoiding exposure to strong magnetic fields can prevent magnetic domain reversal and magnetic weakening.

3. Improve safety: The correct use method can improve the safety of neodymium magnets. Avoiding severe mechanical shocks and long-term cyclic magnetic field changes can prevent hysteresis and loss of magnetism, thereby reducing potential hazards.

4. Protect peripheral equipment: The correct use method can protect peripheral equipment. Be careful to keep neodymium magnets away from sensitive electronic equipment to avoid magnetic field interference and damage to other equipment.

5. Maintain overall performance: Correct maintenance methods can ensure the overall performance of neodymium magnets. Regular inspection and cleaning of neodymium magnets can remove accumulated dust, dirt, etc., and keep their performance stable.

In short, the loss of magnetism of neodymium magnets is a problem that needs to be paid attention to and solved. By understanding the reasons and taking corresponding measures, we can effectively protect and prolong the service life of neodymium magnets and ensure their normal application in various fields.

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Post time: Jun-27-2023