Evidence for giant surface Dzyaloshinskii-Moriya interaction in the chiral magnetic insulator Cu2OSeO3

The depth-dependent skyrmion twisting angle evolution in the chiral magnet Cu₂OSeO₃ is found to be temperature dependent, which is unexpected from a standard micromagnetic model. Here, the authors experimentally identify that the extra twisting of the topological textures is strongly correlated with the noncollinear electric polarization from the same material, suggesting a new mechanism that can control the magnetic skyrmions.