Magnetic anisotropy in Co/Pt films prepared by successive layers deposition of subatomic thicknesses

The magnetic anisotropy of a thin magnetic film, which favors magnetization to be oriented perpendicular to the film plane, attracts interest as an important component for the realization of non-trivial topological states such as magnetic skyrmions. The paper discusses the results of a study of the magnetic anisotropy in [Co/Pt]$_{10}$ films on Si prepared by successive deposition of Co and Pt layers of subatomic thicknesses. The anisotropy constant and its type (easy axis or easy plane) were estimated using studies of torque, magnetization curves, and ferromagnetic resonance. The patterns of magnetic inhomogeneity calculated using the magnetic anisotropy constant established in the experiment are consistent with the experimental patterns of magnetic force contrast studied earlier. The estimation of the interface magnetic anisotropy constant of the studied Co/Pt films was $k_i$ = (0.50 $\pm$ 0.17) erg/cm$^2$.