Schematic of multiscale modeling of a skyrmion system. Solving the electronic structure on the DFT level (left), with the kohn-Sham equations to solve for the wave functions, provides parameters for the atomistic model, with a pairwise effective Heisenberg interaction to solve for the (atomic) magnetic moments (middle). The atomistic model is then used to describe the physics on the nanoscale or used for multi-scale modelling of devices using micromagnetic simulations, using micromagnetic energetics to solve for the magnetization vector field (right).