Control of Dzyaloshinskii-Moriya interaction in Mn1-x Fex Ge: A first-principles study

Takashi Koretsune, Naoto Nagaosa, Ryotaro Arita

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)

Abstract

Motivated by the recent experiment on the size and helicity control of skyrmions in Mn1-x Fex Ge, we study how the Dzyaloshinskii-Moriya (DM) interaction changes its size and sign in metallic helimagnets. By means of first-principles calculations, we successfully reproduce the non-trivial sign change of the DM interaction observed in the experiment. While the DM interaction sensitively depends on the carrier density or the detail of the electronic structure such as the size of the exchange splitting, its behavior can be systematically understood in terms of the distribution of anticrossing points in the band structure. By following this guiding principle, we can even induce gigantic anisotropy in the DM interaction by applying a strain to the system. These results pave the new way for skyrmion crystal engineering in metallic helimagnets.

Original languageEnglish
Article number13302
JournalScientific reports
Volume5
DOIs
Publication statusPublished - 2015 Aug 25
Externally publishedYes

ASJC Scopus subject areas

  • General

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