Is there a reference to standard values of micromagnetic parameters?

[Breno M. Cecchi]

I was wondering if there is some quick reference to standard values of micromagnetic parameters (Ms, A, K, alpha, etc) of magnetic materials. I know the usual values used for some common materials (such as Py or Co) from textbooks, articles or even mumax website and the standard problems...but is there a reference dedicated to display these informations in an organized way? Even for those common materials I see some variations in the exact values used.

Thanks,

Breno

[J A. Fernandez-Roldan]

There is not a standard reference rather than looking up in literature for recent works or specific values. Even different papers from different researchers may use different values for the same material (in a reasonable way).

I can provide you a Table of some common materials in refs.:

• J.A. Fernandez-Roldan et al., „Micromagnetic modelling of magnetic domain walls and domains in cylindrical nanowires”, Book Chapter in Magnetic Nano- and Microwires (2nd Edition), Ed. M. Vazquez, Elsevier, Pages 403-426, ISBN 9780081028322, DOI:10.1016/B978-0-08-102832-2.00014-1, (2020). 
• The preprint is available for free in Arxiv: https://arxiv.org/pdf/1907.02318

Also other parameters have been group in:

• Yu P Ivanov et al 2013 J. Phys. D: Appl. Phys. 46 485001

I hope this is useful for your research.

[Joshua Lauzier]

Hello,

There are a number of handbooks/textbooks with values, but I'm not aware of a comprehensive one. However, it's difficult to find a standard value for many materials. The reason you see variation is because the magnetic properties of a material is often fairly sensitive to how it was made- for example, Py can vary pretty wildly depending on the ratio of Fe to Ni. Thin films or nanostructures can be very different from bulk. And of course things like crystallinity etc.

If you're an experimentalist, you'll often want to get the values directly from your own samples if possible (not always possible, particularly for A). If not, i usually do a literature search and try to find a value where the sample was made with a similar technique (ideally same growth method, substrate, etc). Preferably more recent works.

For 'default' materials like Co,Fe etc, i tend to use something like Cullity's 'Introduction to Magnetic Materials', which is a fairly standard text. Offhand, i believe it has most values for Co/Ni/Fe. But a lot of more specialized materials you often need to look for a specialized text/paper. G. Engdahl's Handbook of Giant Magnetostrictive Materials (2000) is good starting place for large magnetostrictive materials (like Terfenol-D), for instance.

Best,

Josh L.

[Breno M. Cecchi]

Thank you for the feedback, I think that will help!

Breno