open access

https://hdl.handle.net/2115/86578

Skyrmion crystal under D3h point group : Role of out-of-plane Dzyaloshinskii-Moriya interaction

英語

2022-06-28

American Physical Society (APS)

Physical Review B

105(22)

224423

The Dzyaloshinskii-Moriya (DM) interaction that originates from relativistic spin-orbit coupling in noncentrosymmetric magnets is a source of topological spin textures. We theoretically investigate the possibility of a skyrmion crystal (SkX) by focusing on the role of the out-of-plane DM interaction that is different from the polarand chiral-type DM interaction. By performing the simulated annealing for a spin model on a triangular lattice belonging to the D3h point group, we construct low-temperature magnetic phase diagrams in an applied magnetic field. As a result, we find the instability toward different skyrmion crystals under in-plane and out-of-plane magnetic fields, where the key ingredients to stabilize the SkX are different according to the magnetic field direction; the SkX is stabilized under the out-of-plane DM interaction for the in-plane magnetic field, while it is stabilized by additionally introducing an easy-axis anisotropy for the out-of-plane magnetic field. We also discuss the possible multiple-Q states other than the skyrmion crystals in the presence of the out-of-plane DM interaction. Our result indicates that noncentrosymmetric magnetic materials with the out-of-plane DM interaction are potential candidates to host the skyrmion crystals.

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