The effect of the Dzyaloshinsky-Moriya interaction on the magnetic structure of an ordered FePt monolayer
deposited on the Pt(111) surface has been investigated. In the ground state, the pronounced anisotropic geometry
of the FePt layer with alternating Fe and Pt chains gives rise to a helimagnetic structure with a strong difference in
the helicity period along the chains and perpendicular to them. In the presence of an external magnetic field, the
region of stable Skyrmion magnetic structures in the B-T phase diagram has been demonstrated via Monte Carlo
simulations using the parameters obtained within first-principles electronic structure calculations. The present
study demonstrates clearly that the ratio of the exchange coupling parameters J/D for a deposited magnetic
film—being of central importance for the formation of Skyrmions—can be manipulated by growing an overlayer
of 2-dimensional compounds with the atoms carrying spontaneous magnetic moments separated by the atoms of
nonmagnetic elements.