Evaluation of Dzyaloshinskii–Moriya interaction in metallic nanoheterostructures: methodology and experiment

A theoretical and experimental study of the weak antisymmetric Dzyaloshinskii–Moriya exchange interaction for multilayer metal nanostructures of the heavy metal/ferromagnet type is carried out. To assess the Dzyaloshinskii–Moriya interface interaction, methods for studying the dynamics of magnetic domains in a film, determining the magnitude of the current-induced field from the magnitude of the external magnetic field in the plane of the film, and studying the field of nucleation of magnetic domains are considered. An experimental comparison of the methods is carried out and it is shown that for the Pt(4)/Co(0.7)/MgO(2 nm) nanostructure, all of them give close estimates of the Dzyaloshinskii–Moriya interaction field, but the domain nucleation method is technically easier to implement and does not impose high requirements on the quality of the samples. This method is recommended for studying the evolution of the Dzyaloshinskii–Moriya interaction energy in thin-film nanostructures along with the widely used contactless method for estimating spin-wave dispersion anomalies.