摘要：SummaryBased on density functional theory calculations, we elucidated the tunability of the atomic structures and magnetic interactions of Co/Pt3interface (one layer of hcp(0001) Co and three layers of fcc(111) Pt) and thus the skyrmion sizes using strain. The dispersion relations of the spin spiral in the opposite directions, E(q) and E(-q), were evaluated based on generalized Bloch equations. Effective exchange coupling (EC) and Dzyaloshinsky-Moriya interaction (DMI) parameters between different neighborsJianddiat different lattice constants were derived by fitting the resulting spin spiral dispersion E(q) to EC model with DMI and E(q)-E(-q) formula, respectively. We observed an increase in DMI and a significant decrease in EC with an increase in strain. Hence, the size of Néel-type skyrmions determined by the ratio of EC/DMI can be controlled by applying strain, leading to an effective approach to tailor the formation of skyrmion lattices by inducing slight structural modifications on the magnetic thin films.Graphical abstractDisplay OmittedHighlights•Calculate the EC and DMI of multi-nearest neighbors in the VASP program•Show detailed changes of multi-nearest neighboring EC and DMI with deformation•The size of skyrmion does decrease as the lattice constant increases•Distance between Co and Pt layer determines the size of DMICondensed matter physics; Interface Science; Nanomaterials
