To initialize a simulation in a Skyrmion lattice state with a Skyrmion diameter of 50 nm in MuMax3, you can follow these steps:
1. Define the geometry of the system: Define the size and shape of the simulation region using the SetGridSize and SetCellSize commands in the input script. For example, you can set the mesh size to 1 nm × 1 nm × 1 nm.
2. Define the magnetic properties of the system: Define the magnetic properties of the material being simulated, such as the saturation magnetization, exchange stiffness constant, and Dzyaloshinskii-Moriya interaction strength. These parameters can be defined using the Msat, Aex, and Dind commands in the input script (Theses parameters will play a role to determine the skyrmion size)
3. Initialize the system in a Skyrmion lattice state: Use the NeelSkyrmion(int, int)