Neodymium Magnets vs Rare Earth – A Complete Comparison

Neodymium Magnets Vs Rare Earth

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:

  1. Neodymium magnets
  2. Samarium Cobalt Magnets

They are made from rare-earth elements. The two are permanent magnets with strong magnetic fields.

 

Theoretically, these magnets have a Tesla rating exceeding 1.2.

Variable to Compare Neodymium Magnets Samarium Cobalt Magnets
Main Element composition ·         Neodymium

·         Iron

·         Boron

·         Hence, the abbreviation NdFeB Magnets

·         They have a crystal structure

·         Samarium

·         Cobalt

·         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:

 Neodymium Magnets
Neodymium 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

Magnetic Field Strength
Magnetic Field Strength

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.

Conclusion

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.

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