1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

A Can a demagnetized neodymium magnet be restored?

  1. May 17, 2016 #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.
     
  2. jcsd
  3. May 17, 2016 #2

    CWatters

    User Avatar
    Science Advisor
    Homework Helper

    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.
     
  4. May 17, 2016 #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.
     
  5. May 17, 2016 #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?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Can a demagnetized neodymium magnet be restored?
Loading...