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Inducing skyrmions in ultrathin Fe films by hydrogen exposure

Author

Listed:
  • Pin-Jui Hsu

    (University of Hamburg
    National Tsing Hua University)

  • Levente Rózsa

    (University of Hamburg
    Hungarian Academy of Sciences)

  • Aurore Finco

    (University of Hamburg)

  • Lorenz Schmidt

    (University of Hamburg)

  • Krisztián Palotás

    (Slovak Academy of Sciences
    University of Szeged)

  • Elena Vedmedenko

    (University of Hamburg)

  • László Udvardi

    (Budapest University of Technology and Economics
    Budapest University of Technology and Economics)

  • László Szunyogh

    (Budapest University of Technology and Economics
    Budapest University of Technology and Economics)

  • André Kubetzka

    (University of Hamburg)

  • Kirsten von Bergmann

    (University of Hamburg)

  • Roland Wiesendanger

    (University of Hamburg)

Abstract

Magnetic skyrmions are localized nanometer-sized spin configurations with particle-like properties, which are envisioned to be used as bits in next-generation information technology. An essential step toward future skyrmion-based applications is to engineer key magnetic parameters for developing and stabilizing individual magnetic skyrmions. Here we demonstrate the tuning of the non-collinear magnetic state of an Fe double layer on an Ir(111) substrate by loading the sample with atomic hydrogen. By using spin-polarized scanning tunneling microscopy, we discover that the hydrogenated system supports the formation of skyrmions in external magnetic fields, while the pristine Fe double layer does not. Based on ab initio calculations, we attribute this effect to the tuning of the Heisenberg exchange and the Dzyaloshinsky–Moriya interactions due to hydrogenation. In addition to interface engineering, hydrogenation of thin magnetic films offers a unique pathway to design and optimize the skyrmionic states in low-dimensional magnetic materials.

Suggested Citation

  • Pin-Jui Hsu & Levente Rózsa & Aurore Finco & Lorenz Schmidt & Krisztián Palotás & Elena Vedmedenko & László Udvardi & László Szunyogh & André Kubetzka & Kirsten von Bergmann & Roland Wiesendanger, 2018. "Inducing skyrmions in ultrathin Fe films by hydrogen exposure," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04015-z
    DOI: 10.1038/s41467-018-04015-z
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