Exchange coupling constant in micromagnetic simulation

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SUMMARY

The discussion centers on the exchange coupling constant in micromagnetic simulations, specifically in the context of the Landau-Lifshitz-Gilbert (LLG) equation. The typical value for the exchange constant is approximately 10^-11 J/m, with specific materials like Permalloy (Nickel-Iron) having a value around 13e-12 J/m. Participants recommend resources such as the Nmag manual and Wikipedia for further information on exchange constants across various materials.

PREREQUISITES
  • Understanding of the Landau-Lifshitz-Gilbert (LLG) equation
  • Familiarity with micromagnetic simulation tools like Nmag
  • Knowledge of magnetic materials and their properties
  • Basic grasp of exchange interactions in magnetism
NEXT STEPS
  • Research the Nmag simulation tool for micromagnetic modeling
  • Explore the Wikipedia page on exchange interaction for detailed definitions
  • Investigate the properties of Permalloy and its applications in simulations
  • Look for academic papers or handbooks that compile exchange constants for various magnetic materials
USEFUL FOR

Researchers and engineers in the field of magnetism, particularly those involved in micromagnetic simulations and material science, will benefit from this discussion.

rocdawn
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Hi, all.

I'm wondering if anyone's done some simulation of magnetic material with LLG equation. The question is where can I find the value of exchange constant for a material.

In LLG equation, the exchange constant is in the unit of "J/m", and the typical value is 10^-11 J/m, for some magnetic metal as far as I know. But I can't find a handbook or any online material summarizing this parameter for different materials. It seems complicated to derive based on the structure. Does anyone know where to look for such values?

Thanks in advance.
 
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Hi,
Not sure if you still require this information but I am doing some similar work, using Nmag. http://nmag.soton.ac.uk/nmag/current/manual/manual.pdf contains some generic value's mostly for Permalloy (Nickel-Iron) which should be about 13e-12 J/m .

If you do find a better source please let me know as I am looking for something more concrete.

All the best
 
I was confronted with the same problem, but the answer was in wikipedia: en.wikipedia.org/wiki/Exchange_interaction
Look up A = Exchange-stiffness constant
 

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