Simulating Skyrmions (Python API)

[bufay]

Hi,everyone!
I use VASP package to caculate the calculate the magnetic parameters , and divided the calculated magnetic moment of the magnetic atom by 2 as $\mathop{S}\limits^{\rightarrow}$ , which was also set as the $\mu_s$ parameter in input.cfg. Similarly, $J_1$, $J_2$ , $J_3$ , $K_{ani}$, $D_{dmi}$ were also divided by $S^2$.

$$ H = \sum_{i , j} J_{1}(\mathop{S_{i}}\limits^{\rightarrow} \cdot \mathop{S_j}\limits^{\rightarrow}) +\sum_{i , k} J_{2}(\mathop{S_{i}}\limits^{\rightarrow} \cdot \mathop{S_k}\limits^{\rightarrow}) + \sum_{i , l} J_{3}(\mathop{S_{i}}\limits^{\rightarrow} \cdot \mathop{S_l}\limits^{\rightarrow}) + \sum_{i , j} \mathop{d_{ij}}\limits^{\rightarrow} \cdot (\mathop{S_i}\limits^{\rightarrow} \times \mathop{S_j}\limits^{\rightarrow}) + \sum_{i} K(S_i^z)^{2} $$

I inputted these parameters to simulate the Skyrmions by the lllg-heun method in python package, but the Skyrmions displayed were elliptical. Different from the circular Skyrmions in other people's literature, I want to know if there is something wrong with my input file, Thank you
[inut.txt](https://github.com/spirit-code/spirit/files/11154957/inut.txt

[Moritz Sallermann]

Hey, how did you determine the Skyrmions to be elliptical?

I have used your inputfile in the Spirit GUI and the Skyrmions, after energy minimization, seem to be circular:

[bufay]

thanks ,you're right