Neodymium magnets are a type of strong magnetic material that possesses a high magnetic energy product and remanence. The common grades range from N35 to N52. However, below N35, there are also low remanence neodymium magnets like N33, N30, N28, and N25, which is the main topic of this article.
Concept of Low Remanence Neodymium Magnets
Remanence refers to the magnetic flux density that remains in a magnet after an external magnetic field is removed. The lower the remanence, the easier it is to demagnetize the magnet.
Low-remanence neodymium magnets, such as N33, N30, N28, and N25, are categorized based on their remanence (Br), which is lower than that of higher-grade magnets like N35. Although these neodymium magnets may not possess high magnetic performance, they still have a variety of applications in daily life.
Magnetic Properties of Low Remanence Neodymium Magnets
| Label | Grades | Max.Temp(C) | ||
| AH | 28AH | 30AH | 33AH | 230 |
| EH | 28EH | 30EH | 33EH | 200 |
| UH | N/A | 30UH | 33UH | 180 |
| SH | N/A | 30SH | 33SH | 150 |
| H | N/A | 30H | 33H | 120 |
| M | N/A | 30M | 33M | 100 |
| N | N/A | N30 | N33 | 80 |
| BHmax(MGOe) | 28 | 30 | 33 | |
| Br(tesla) | 1.05 | 1.1 | 1.15 | |
Advantages of Low Remanence Neodymium Magnets
| Cost Reduction: Generally, low remanence neodymium magnets are less expensive. If these low remanence magnets can provide sufficient strength, they represent a cost-saving option for users.
| Controllable Demagnetization: Low remanence magnets (like N33) can be beneficial in applications where the magnetic field strength should not be permanent, thereby allowing control over magnetic behavior.
Considerations of Using Low Remanence Neodymium Magnets
When using low-remanence neodymium magnets, several factors should be considered:
| Temperature: Low remanence is the magnetic property of these magnets. Care must be taken to avoid scenarios that may lead to unintended demagnetization due to high temperatures.
| Magnetic Interference: In systems where multiple magnets are used, the interactions between them should be assessed, as low remanence may lead to unintended effects on performance.
Low Remanence Neodymium Magnets For References
| Diameter | 15 mm (±0.1 mm) |
| Height | 1.5 mm (±0.1 mm) |
| Weight | 2 g |
| Material | Neodym N33 |
| Magnetization | Axial |
| Max. Operating Temp. | 80°C. |
| Coating | Ni+ Cu+ Ni |
Applications of Low Remanence Neodymium Magnets
Magnetic Toys
| Magnetic Building Sets: Composed of multiple small magnets that can snap together to form various shapes and structures, providing entertainment and creative fun.
| Magnetic Car Stickers and Signs: Used for movable advertising and information display on vehicles, easy to install and remove.
Household Items
| Refrigerator Magnets: Used to hold items such as photos, memos, and recipes on refrigerators for easy organization and display of information.
| Magnetic Hooks and Hangers: Used to hang items like keys, hats, and handbags without the need for drilling or adhesives.
Stationery and Package
Single-Sided Magnets: Widely used in the printing industry, such as in gift packaging boxes and mobile phone packaging.
Despite the lower magnetic strength of low-performance neodymium magnets, they still play an important role in many areas of daily life.
NdFeB Magnets Provider
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