Where to Buy Neodymium Magnets?
To get the best quality of neodymium magnets, ensure you order from a trusted and leading supplier with a high reputation. ROBO Magnetic is one such company. We have been manufacturing and supplying high-quality neodymium magnets to customers in Europe, America, and Asia for over 16 years. Over this period, we have never had a problem with quality control in the recipient country because we have excellent and certified engineers who use the latest technology and our unique process to produce powerful neo magnets that meet international standards.
Another thing that differentiates us is that we speak directly with our customers. So when you contact us, you are in direct contact with the company, not a middleman. We would love to help with your project. To get started, reach out to us and let us know what you need.
What are Rare-earth Magnets and Their Types?
One of the biggest misconceptions is the thought that “rare earth” magnets are scarce. The simple truth is that rare earth magnets are not termed “rare” because of their availability. Instead, they are called “rare earth” because they are not found in large concentrated amounts.
It means rare earth metals are not found in large concentrated amounts, unlike other elements. Instead, they are dispersed with other elements, making them hard to mine. Hence this is enough reason why rare earth metals suppliers are very hard to come by.
Although often regarded as the strongest permanent magnets in the world, rare earth Magnets have also shown that they can perform better than other types of Magnets, e.g., alnico magnets. Before fully understanding what a rare earth magnet is, you need to understand some things first. For example, their origin, types, what they are made of, and most importantly, what they are used for.
If you are familiar with the periodic table, you will notice that 17 elements are grouped under this rare earth family in the rare earth column. Of those 17 elements, fifteen are known as lanthanides, while the remaining two are yttrium and scandium. The importance of these elements to the development of science and technology can not be overstated. It is evident that most high-tech industries now use rare earth elements (one of them is Apple). It is believed that Apple uses 17 rare earth elements such as neodymium, praseodymium, dysprosium, and samarium elements in the production of the iPhone.
There are two types of rare earth magnets: Samarium cobalt and neodymium. Let us briefly differentiate between the two.
Samarium Cobalt
This rare earth magnet was the first to be discovered. They are not as strong as neodymium magnets, plus their magnetic field is significantly lower than that of neodymium magnets. Another disadvantage of Samarium cobalt is that they are more expensive than neodymium magnet. However, unlike neodymium, samarium does have a very high curie temperature and oxidation resistance.
Neodymium
On the other hand, this rare earth magnet is significantly cheaper than Samarium cobalt. Plus, they possess higher coercivity. They are also regarded as the strongest magnet in the market, enough reason why they have a high resistance to demagnetization. However, just like Samarium cobalt, neodymium also has some disadvantages. For instance, their mechanical strength and corrosion resistance are meager. Plus, they are not always stable in high temperatures.
What are Neodymium Magnets?
Have you ever encountered “NIB” and been confused about what it stands for? The abbreviation “NIB” means Neodymium Magnet to answer the question.
Neodymium magnets which were first developed in 1982, are made from boron, neodymium, and an alloy of iron and are considered the strongest magnet material in the world right now(even stronger than samarium). Apart from their level of coercivity, neodymium magnets also perform better than other types of magnets, plus they are incredibly cheap.
FAQs about Neodymium Magnets
If you don’t know much about Neodymium Magnet or are hearing it for the first time, we will assume that you have many questions to which you need answers.
We live in a world where misinformation travels faster than light. So, there is a high chance you may have heard some misconceptions about this type of magnet. This section will debunk some of these misconceptions and answer some questions you may find confusing.
- How long do neodymium magnets last? Neodymium magnets are called permanent magnets for one. They don’t lose magnetization quickly unless they exceed their curie temperature.
- Can neodymium magnets get rusty if the surface remains exposed? The simple answer to this is yes. If the surface of a neodymium magnet is not protected by coating, it will become rusty over time.
- Are there different grades of neodymium magnets? Yes, there are. Each grade has its properties, and most importantly, its operating temperature limits are very different.
- Why are neodymium magnets so strong? Neodymium magnets are considered strong because of their ability to survive demagnetization.
What Can Neodymium Magnets be Used for?
Neodymium magnets are becoming increasingly popular because they are used in various industries, including automobile, medical, renewable energy, DIY machines, audio equipment, satellite systems, and many others. In short, neodymium magnetic is all around you!
In the health care industry, for example, neodymium magnets produce MRIs (Magnetic resonance imaging), Magnotherapy, and other medical devices. Also, in audio equipment, neodymium magnets and an electric current control audio speakers and microphones. This type of magnet is also used in devices that can levitate, e.g., hovering toys and hoverboards.
Lastly, you can find a neodymium magnet in some of the DIY machines you have in your house.
Qualities of Neodymium Magnets
Neodymium magnet, also called NdFeB magnet, is considered the strongest magnet on earth. This magnet type is characterized by its strong magnetic properties and resistance to demagnetization. Neodymium magnet is used in electrical equipment, aerospace, toys, and health devices because of their qualities.
Max Energy Products (BhMax)
Maximum Energy Product (BH)max is used to measure the maximum magnetic energy stored in a permanent magnet. That is, it shows the strength of the magnet. This energy density is located in the space between the two magnetic poles.
The magnet’s size will indicate that particular magnet’s performance, which means that a large and a small magnet will perform irrespective of the difference in their energy production. The unit of measurement for (BH)max is MGOe (Mega-Gauss-Oersted) or kJ/m³ (Kilojoule per cubic meter), where 1 MGOe is equivalent to 7.958 kJ/m3.
Coercivity
The coercivity of a magnet is one of the essential qualities a magnet must possess. Magnetic coercivity is the ability of a magnet to remain stable against external forces that could demagnetize it. And this is why Neodymium Magnet is head and shoulder above other types of magnets because the coercive nature of the neodymium magnet is one thing that sets it apart from other types of magnets.
As we previously mentioned, Neodymium magnets are by a stretch the most powerful permanent magnet on the market. Their ability to resist demagnetization makes them a top choice for industries that now use magnets. However, as strong as neodymium magnets, they can’t withstand a high temperature – when they are exposed to a high temperature, their usage will be limited.
Magnetic coercivity is grouped into two types, and the measurement you will use will depend on the level you wish to reduce the magnetization.
- Normal coercivity (Hcb)denotes the magnetic field required to reduce the magnetic flux to zero.
- Intrinsic coercivity (Hcj): This, on the other hand, denotes the level required if you want to completely demagnetize the magnet ( reduction of the magnetization to zero)
Remanence
Remanence, whose symbol is Br, refers to the ability of a magnet to be still magnetic even after the magnetizing field has withdrawn to a certain degree. In short, remanence is used to measure the degree of magnetization.
Neodymium magnet, in particular, has very high remanence, another quality that makes neodymium Magnet the best in the market. However, for various reasons, not every device that uses a neodymium magnet needs it to be remanent. Therefore, to remove remanence from a magnet, you need to demagnetize such magnet completely.
According to the international unit system, the unit of remanence is Tesla (T), while it is Gauss (G), 1T = 10000G under the CGS Gauss unit system.
Neodymium Magnets’ Temperature Resistance
Neodymium magnets are famed for their coercivity and strength, but not so much for their ability to withstand high temperatures. The lowest neodymium magnets can withstand a temperature of up to 80°C. So when subjected to a temperature higher than 80°C, they lose their magnetic output. However, since neodymium magnets have several grades, it won’t be fair to generalize the amount of temperature they can withstand. For example, neodymium magnet types that fall under TH/AH ratings can withstand temperatures as high as 230°c, while grade SH magnets can operate in temperatures up to 150°C – 302°F. Below is the temperature resistance table for neodymium magnets.
| Grade | Max Operating Temperature | Curie Temperature |
| N | 80°C or 176°F | 310°C or 590°F |
| M | 100°C or 212°F | 340°C or 644°F |
| H | 120°C or 248°F | 340°C or 644°F |
| SH | 150°C or 302°F | 340°C or 644°F |
| UH | 180°C or 356°F | 350°C or 662°F |
| EH | 200°C or 3922°F | 350°C or 662°F |
| TH/AH | 220°C or 428°F | 350°C or 662°F |
What Happens When a Neodymium Magnet Grade Exceeds Its Temperature?
When a grade of neodymium magnet exceeds its maximum operating temperature, the magnet will experience an irrecoverable loss in performance. That is because as the magnet exceeds its operating temperature, it will begin to lose 0.11% of its magnetism per 1 degree rise in the temperature (0.11% per 1 degree Celsius rise in temperature).
If the magnet is not completely demagnetized, such a magnet can still be re-magnetized. You must get a neodymium pole and repeatedly rub the old neodymium magnet against it until it becomes re-magnetized.
Conclusion
The difference between a regular magnet and a Neodymium magnet is so enormous, which is why the magnet is far more popular than an ordinary magnet. The popularity of this magnet is evident in the number of industries that now use it – virtually every device out there, including your DIY equipment, makes use of neodymium magnet.
Aside from its coercivity and ability to last very long, the price difference between a neodymium magnet and a regular magnet also sets the NdFeB magnet apart from the rest.
