Exchange coupling constant in micromagnetic simulation

rocdawn
Messages
1
Reaction score
0
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.
 
Physics news on Phys.org
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
 

Thread 'Instantaneous dipole moment and orbitals'

Hi. I have got question as in title. How can idea of instantaneous dipole moment for atoms like, for example hydrogen be consistent with idea of orbitals? At my level of knowledge London dispersion forces are derived taking into account Bohr model of atom. But we know today that this model is not correct. If it would be correct I understand that at each time electron is at some point at radius at some angle and there is dipole moment at this time from nucleus to electron at orbit. But how...
View full post »

Similar threads

A Monte Carlo Wang-Landau_antiferromagnetic perovskite
Replies
3
Views
2K
Spin-Orbit-Torque: Where is the damping-like Term in the pic and why?
Replies
2
Views
4K
I Need a good idea : 3D simulation of Inductive wireless power transfer
Replies
6
Views
2K
A Question about a measured spectra
Replies
7
Views
2K
A Search for CPT violation with protons/antiprotons using quantum logic
Replies
1
Views
2K
A Kirkendall effect: vacancy concentration and pair interaction energy
Replies
1
Views
2K
On the physics of exchange, correlationa and coupling phenomena
Replies
3
Views
2K
A Effective Spring Constant of a Chain Polymer
Replies
2
Views
3K
COMSOL simulation of a 3D Ferrite Bar Numerical Model For Magnetic Flux
Replies
5
Views
3K
Dependence of exchange interaction on system size in Ising model
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top