Can a demagnetized neodymium magnet be restored?

In summary, the conversation discusses whether a Neodymium magnet can regain its magnetic properties after being demagnetized. It is explained that Neodymium is not naturally a magnet and needs to be turned into one through a process involving a coil and current. It is also mentioned that heating the magnet above its Curie temperature and applying a magnetic field can restore its magnetic properties. There is no need to dissolve the magnet or extract the Neodymium. The concept of Neodymium being paramagnetic and not ferromagnetic is also discussed. The purpose of the conversation remains unclear.
  • #1
juyoung518
8
1
Can a Neodymium magnet get back it's magnetic properties after being demangnetized?

Say that there is a Neodymium magnet(Nd-Fe-B) that has been demagnetized(turned paramagnetic) at a temperature higher than its curie temperature.

If I extract the demagnetized Neodymium(Nd) from the magnet(Nd-Fe-B) by dissoving the magnet in an acidic solution and Electrowinning(Electro extraction) it, will the extracted Neodymium regain it's ferrous properties?
Thanks in advance.
 
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  • #2
Neodymium isn't naturally a magnet. What I mean is it doesn't come out of the ground magnetised. You have to turn it into a magnet by putting it into a coil and passing a large current through it. So simply extracting the Neodymium from a demagnetised magnet won't turn it back into a magnet.

There is no need to extract the Neodymium. You just send the demagnetised magnet back to the factory and put it through the magnetising coil again.
 
  • #3
You don't need to dissolve the magnet. If you heat the magnet above the Curie point (~310C), apply a magnetic field, and slowly cool the magnet, then you should restore the magnetic properties. It might not be necessary to reach the Curie point, if you apply a strong enough magnetic field.
 
  • #4
If you do this dissolving, the fact that initially the magnet is demagnetized is irrelevant. Ferromagnetism is a property of the crystal. So by dissolving the crystal the properties will change anyway.

And Neodymium is paramagnetic so what do you mean by regaining its "ferrous properties"?
Pure Neodymium is not ferromagnetic, is it?

What is the purpose of all this, by the way?
 

Related to Can a demagnetized neodymium magnet be restored?

1. Can a demagnetized neodymium magnet be restored?

Yes, it is possible to restore the magnetization of a demagnetized neodymium magnet.

2. How does a neodymium magnet become demagnetized?

A neodymium magnet can become demagnetized due to exposure to high temperatures, strong magnetic fields in the opposite direction, or physical damage.

3. What is the process for restoring a demagnetized neodymium magnet?

The process for restoring a demagnetized neodymium magnet is called re-magnetization. It involves exposing the magnet to a strong magnetic field in the same direction as its original magnetization.

4. Can all demagnetized neodymium magnets be restored?

In most cases, yes, demagnetized neodymium magnets can be restored. However, if the physical structure of the magnet has been altered or damaged, it may not be possible to fully restore its original magnetic strength.

5. Are there any risks or precautions to take when attempting to restore a demagnetized neodymium magnet?

Yes, there are some risks involved in attempting to restore a demagnetized neodymium magnet. It is important to handle the magnet carefully and avoid exposing it to strong magnetic fields or high temperatures. It is also recommended to seek professional assistance to ensure the magnet is properly re-magnetized.

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