  Determination of the energy of Dzyaloshinskii-Moriya interaction along with a
definition of the basic magnetic characteristics in ferromagnetic/nonmagnetic
multilayered systems are both required for the construction of a magnetic
skyrmion recording medium. A method for estimating the energy of the effective
Dzyaloshinskii-Moriya interaction which compared the periodicities of
micromagnetically simulated and experimentally measured demagnetized domain
structures was shown in a current paper. Symmetric epitaxial [Co/Pd(111)]5
superlattices with Co layers of varying thickness were used as the system for
investigation. The structural and magnetic properties of epitaxial
[Co(dCo)/Pd]5 superlattices with different Co layers thicknesses were
comprehensively investigated. The dependence of the energy of effective
Dzyaloshinskii-Moriya interaction on the thickness of the Co layers in the
[Co(dCo)/Pd]5 multilayered structures was determined. The relationship between
Dzyaloshinskii-Moriya interaction and asymmetry of the strains between the
bottom Pd/Co and top Co/Pd interfaces was discussed. The simulation parameters
and the demagnetization approach prior to measuring the magnetic structure
influenced the obtained results. Necessity of setting all the layers in
micromagnetic simulations was established. The significant influence of
interlayer dipolar coupling on the periodicity of simulated labyrinth domain
structures was also confirmed.
