I know you are probably wondering whether neodymium magnets and rare earth magnets are different or the same thing.
Well, this guide puts this confusion to rest – Let’s dive right in:
Neodymium Magnets Compare Vs. Rare Earth Magnets Comparison
There are two types of rare earth magnets available for any application:
Theoretically, these magnets have a Tesla rating exceeding 1.2.
|Variable to Compare||Neodymium Magnets||Samarium Cobalt Magnets|
|Main Element composition||· Neodymium
· Hence, the abbreviation NdFeB Magnets
· They have a crystal structure
· Iron in some alloys
· Hence the abbreviation SmCo Magnets
· They have a crystal structure
|Cracking||· Less prone to cracking||· Prone to cracking or chipping|
|Working Temperature||· Not stable at high temperatures and will demagnetize at temperatures above 80˚C||· Magnetic properties are stable even at high temperature|
|Corrosion resistance||· Requires plating due to low resistance to corrosion||· Excellent corrosion resistance properties|
|Demagnetization||· High resistance||· High resistance|
|Cost||· Low||· High|
|Magnetic strength||· Stronger than Samarium||· Strong|
|When the magnets became available||· 1984||· 1970s|
Neodymium Magnets Benefits
There are many reasons why you may consider these magnets:
Can Retain Magnetic Properties for Years
Neodymium can retain their magnetic properties for a long time.
Theoretically, after 10 years rare earth magnets can lose only 1% of their magnetic properties.
Note: To achieve this, you must use these magnets within a safe temperature (normally 80 degrees Celsius).
A Wide Range of Magnetic Strengths Available
You can choose from N35, N48 to N52 (Of course, there are other series). For instance, depending on the material grade, you may have:
- N35 – 12,200 Gauss
- N48 – 14,100 Gauss
- N52 – 14,800 Gauss
Even as you strive to get the strongest rare earth magnet for your application consider the mechanical properties. Normally, increasing magnetic strength will contribute to the magnet’s brittleness.
Although ceramic magnets have stronger magnetic strength, the NdFeB magnets are still powerful.
Best for Applications with Limited Space but Require High Magnetic Field Strength
In applications where space is limited such as car magnetic speakers or headphones magnetic speakers, they are a perfect choice.
These magnets make components miniaturization easier and simple. Consequently, they allow for design flexibility.
Not Affected by External Magnetic Fields
It can withstand an external magnetic field without any interference.
Limitations of Neodymium Rare Earth Magnet
Even as you consider these magnets for your applications, you should take note of:
Not suitable for very High-Temperature Applications
Beyond 80˚C the magnet will lose its magnetic properties. A reason you cannot weld or machine these permanent magnets.
The heat generated through the process will demagnetize the magnet.
At above 310˚C curie temperature, the neodymium will lose all their magnetic properties. Unfortunately, they may not recover their magnetic properties.
Not Resistant to Corrosion
NdFeB rare earth magnets are not resistant to corrosion. As a result, they require plating. Additionally, when exposed to moisture, the chance of oxidation remains high.
High Cost Magnets
There are significant facts to note here:
- Neodymium magnets are expensive compared to ferrite magnets
- Affordable rare earth magnet is a neodymium magnet
Additionally, their price tends to fluctuate. Of course, this is due to the fluctuation in rare earth metal prices.
Currently, China is the leading producer of REEs. In 2021, China produced 168,000 tons. This makes China your best bet when you want to source for rare earth magnets.
A reason you should count on Daily Mag Magnets.