Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

NdFeB magnetizing

NdFeB magnetizing

NdFeB magnetizing

Can Neo be magnetized easier by raising the temperature during magnetization?

Clyde Hancock
Design & analysis of electric motors and generators

RE: NdFeB magnetizing

You could, but the material would be under-saturated when it cooled back to RT.
Sounds like you just need more power.
One thing to check with pulse magnetization is the pulse duration.
It is often better to slightly reduce the peak field in exchange for longer duration.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: NdFeB magnetizing

I don't believe so. Elevating the temperature will reduce coercivity but studies have shown coercivity doesn't play a huge role during magnetization for Neo. Assuming they are in the virgin state, a high coercivity Neo will fully magnetize at the same magnetizing strength as a lower coercivity Neo.

In addition, you run the risk of the magnet self demagnetizing a bit because the heat reduced the coercivity too much.

The IEC published a nice technical report in 2009 on the magnetization behavior of permanent magnets. Amongst other things it showed, in general, that 3 Tesla is adequate to magnetize Neo.

Here's a link to the IEC Webstore for that technical report:

RE: NdFeB magnetizing

Thanks everyone!

Clyde Hancock
Design & analysis of electric motors and generators

RE: NdFeB magnetizing

theoretically yes. since raising temp will not only decrease Hc but also decrease relaxation time drastically (less duration), both of which make magnetization itself easier. However it is a thermal demag. process, that could make it practically worse. If holding the magnetizing field to some degree as temperature cool down, it might work...an unknown to me.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close