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

material without hysteresis

material without hysteresis

material without hysteresis

Hi everyone. can you advise me please?
I am looking for a solid material without hysteresis with a relative magnetic permeability that goes beyond unity. I don't pretend that it is on par with permalloy or mu-metal but I can be satisfied with a value that is close to 10, if it surpasses it even better.
I need it to make small toroids with enamelled copper wire intended for the creation of an ultra-precise current sensor.
Thank you .

RE: material without hysteresis

Qualified electric parts suppliers have the toroids you seek.

Don't forget, "ultra precise" requires traceable calibration!

RE: material without hysteresis

if you know they exist then why not post a link?

RE: material without hysteresis

Simple search of ferrite toroids will answer your question

RE: material without hysteresis

what makes you think that the ferrite is free from hysteresis?

RE: material without hysteresis

It all depends on the current level you intend to measure, and if AC or DC, and if AC what frequency.

All traditional magnetic materials have some level nonlinear behavior. It all depends on the intricate details of your measurement and your lab setup.

RE: material without hysteresis

if I asked for a material with magnetic permeability it means that it is AC. it doesn't work in DC.
what I wrote in the first message is clear, "without hysteresis".
I didn't write: with little hysteresis.

RE: material without hysteresis

you have answered your own question, such materials do not exist.

RE: material without hysteresis

but what you're saying ?

RE: material without hysteresis

the answer to your original post: "such materials do not exist."

RE: material without hysteresis

It's asking for a material to both be influenced by magnetism and not be altered in the slightest by magnetism.

As far as I know liquid oxygen meets that requirement.

RE: material without hysteresis

Even O2 Analyzers that relied on its atomic magnetic moments.

RE: material without hysteresis

Arivel: You are looking for a superparamagnetic material. As far as I am aware, the only thing commercially available material are nanoparticles used for magnetic separation. I'm not aware of anyone selling them in bulk form suitable for a current sensor.
Here is a link to one such provider: https://www.sigmaaldrich.com/US/en/search/superpar...

RE: material without hysteresis

Unfortunately, temperature dependencies, and slight hysterisis may be a problem for the OP.

RE: material without hysteresis

OP: you like raise tough questions, do not you?

so basically you are looking for perm <10, no hysteresis, under AC? I am not aware of such exact material, but composite ferrite might be close to what you need.
Permeability is a function of B. under AC, it is a function of frequency, and it also consists of real and imaginary parts. hysteresis is a function of frequency too. Normally, the higher frequency, he bigger the hysteresis. lots of factors to take into consideration.

superparamagnetic is nothing more than the competition between thermal energy (kT) and anisotropic energy (which is proportional to volume, KuV). when it goes to nano-scale, decreased volume cannot overcome thermal activity, losing its ferromagnetic. So if the material is bulk with large volume, there does not exist superparamagnetic

RE: material without hysteresis

This might be a property of a Bose-Einstein condensate. Contact your local university physics department and ask for a couple of kilograms to experiment with. Then you just need to scale up to your volume of production. Easy

RE: material without hysteresis

For real world ferrites, the OP might consult Lax and Button dealing with ferrimagnetics.

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


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