Imaging the coupling between itinerant electrons and localised moments in the centrosymmetric skyrmion magnet GdRu<sub>2</sub>Si<sub>2</sub>

ORAL

Abstract

Magnetic skyrmions have been considered to be stabilized by the Dzyloshinskii-Moriya interaction originating from inversion-symmetry breaking structures. Recently, however, magnetic skyrmion lattices have been reported in inversion-symmetric Gd based compounds [1]. These skyrmion lattices are proposed to be stabilized by multiple-spin interactions, which are mediated by itinerant electrons [2-4].
We performed spectroscopic-imaging scanning tunneling microscopy experiments on GdRu2Si2 to investigate the nature of the coupling between itinerant electrons and localized magnetic moments. It revealed that the local density of states near the Fermi energy (~ 0.1 eV) shows characteristic spatial patterns in accordance with the magnetic structures. The patterns are well reproduced by charge-density distributions calculated based on the multiple-spin interaction and the exchange coupling between itinerant electrons and Gd local moments.
[1] N. D. Khanh et al., Nat. Nanotechnol. 15, 444 (2020).
[2] R. Ozawa, S. Hayami, and Y. Motome, Phys. Rev. Lett. 118, 147205 (2017).
[3] S. Hayami, R. Ozawa, and Y. Motome, Phys. Rev. B 95, 224424 (2017).
[4] T. Nomoto, T. Koretsune, and R. Arita, Phys. Rev. Lett. 125, 117204 (2020).

*This work was supported by JST CREST Grant No. JPMJCR16F2

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Presenters

  • Yuuki Yasui

    • Center for Emergent Matter Science, RIKEN

Authors

  • Yuuki Yasui

    • Center for Emergent Matter Science, RIKEN

  • Christopher J. Butler

    • CEMS, RIKEN
    • Center for Emergent Matter Science, RIKEN

  • Nguyen Duy Khanh

    • Institute for Solid State Physics, The University of Tokyo

  • Satoru Hayami

    • Department of Applied Physics, The University of Tokyo

  • Takuya Nomoto

    • Univ Tokyo
    • University of Tokyo
    • Univ of Tokyo
    • Department of Applied Physics, Univ of Tokyo
    • Department of Applied Physics, The University of Tokyo
    • Department of Applied Physics, University of Tokyo

  • Tetsuo Hanaguri

    • RIKEN
    • CEMS, RIKEN
    • Center for Emergent Matter Science, RIKEN

  • Yukitoshi Motome

    • Department of Applied Physics, University of Tokyo
    • Univ of Tokyo
    • Department of Applied Physics, The University of Tokyo

  • Ryotaro Arita

    • Univ of Tokyo
    • University of Tokyo
    • Department of Applied Physics, Univ of Tokyo
    • CEMS, RIKEN
    • Department of Applied Physics, The University of Tokyo
    • RIKEN-CEMS

  • Taka-hisa Arima

    • Department of Advanced Materials Science, The University of Tokyo

  • Yoshinori Tokura

    • RIKEN
    • RIKEN Center for Emergent Matter Science and Tokyo College, The University of Tokyo
    • CEMS, RIKEN
    • RIKEN CEMS
    • Univ of Tokyo
    • Department of Applied Physics, The University of Tokyo

  • Shinichiro Seki

    • Department of Applied Physics, The University of Tokyo