Strongest Magnetic Materials: Rare Earths and NdBFe

In summary, rare earth magnets are a type of permanent magnet made from alloys of rare earth elements. They are significantly stronger than other types of magnets and have high magnetic energy and coercivity. The strongest rare earth magnets are made from a compound called neodymium iron boron (NdFeB), and they are used in a variety of industries such as electronics, automotive, and aerospace. Rare earth magnets are made through a process called sintering and have the advantage of exceptional strength and lightweight, but also have the disadvantage of high cost and brittleness.
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As far as I am aware, Rare Earths and particularly NdBFe is the strongest known magnetic material. Is this true and what is the strongest magnetic material known that it is in common use and what is possible theoretically? Thank you.
 
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As far as I know there's no theoretical limit. The top value in a small volume is something around 30 T and inside an MNR machine is around 2 T.
 

FAQ: Strongest Magnetic Materials: Rare Earths and NdBFe

What are rare earth magnets and how are they different from other magnets?

Rare earth magnets are a type of permanent magnet made from alloys of rare earth elements. These magnets are significantly stronger than other types of magnets, such as ferrite or alnico magnets, and have high magnetic energy. They also have high coercivity, meaning they are resistant to demagnetization.

What are the strongest rare earth magnets?

The strongest rare earth magnets are made from a compound called neodymium iron boron (NdFeB). These magnets have the highest magnetic energy of any magnet currently available, making them the strongest magnets in the world.

What industries use rare earth magnets?

Rare earth magnets are used in a wide range of industries, including electronics, automotive, aerospace, medical, and energy. They are often used in motors, generators, speakers, and hard disk drives due to their high strength and small size.

How are rare earth magnets made?

Rare earth magnets are made through a process called sintering, where the raw materials (neodymium, iron, and boron powders) are compressed and heated to high temperatures in a furnace. The resulting solid material is then cut or ground into the desired shape and coated for protection.

What are the advantages and disadvantages of using rare earth magnets?

The main advantage of rare earth magnets is their exceptional strength and magnetic properties. They are also lightweight and can be made into various shapes and sizes. However, one major disadvantage is their high cost due to the scarcity of rare earth elements. They are also brittle and can lose their strength at high temperatures, making them unsuitable for some applications.

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