Skyrmion lattice in a magnetic film with spatially modulated material parameters

• The conditions of skyrmion stability in magnetic films are analytically calculated.
• The skyrmion lattice initializing by the uniform field is numerically simulated.
• The nanopatterning method to obtain high skyrmion density is suggested.

The problem of the skyrmion stability in the magnetic film with perpendicular anisotropy inside the area with the changed material parameters is considered. The solution describing the conditions of such stabilization in the absence of Dzyaloshinskii–Moriya interaction is obtained analytically. The easy method of nanomodification of ordinary magnetic perpendicular media such as Co,Fe/Pt,Pd,Ru superlattices allowing the formation of the dense enough (with the period less than 100 nm) skyrmion lattices is suggested. By micromagnetic simulations it is shown that the skyrmion lattices can be initialized in the system by simple magnetization in the uniform external magnetic field.