Bulk Dzyaloshinskii–Moriya interaction in amorphous ferrimagnetic alloys

Duck Ho Kim, Mitsutaka Haruta, Hye Won Ko, Gyungchoon Go, Hyeon Jong Park, Tomoe Nishimura, Dae Yun Kim, Takaya Okuno, Yuushou Hirata, Yasuhiro Futakawa, Hiroki Yoshikawa, Wooseung Ham, Sanghoon Kim, Hiroki Kurata, Arata Tsukamoto, Yoichi Shiota, Takahiro Moriyama, Sug Bong Choe, Kyoung Jin Lee, Teruo Ono

Research output: Contribution to journalLetter

6 Citations (Scopus)

Abstract

Symmetry breaking is a fundamental concept that prevails in many branches of physics1–5. In magnetic materials, broken inversion symmetry induces the Dzyaloshinskii–Moriya interaction (DMI), which results in fascinating physical behaviours6–14 with the potential for application in future spintronic devices15–17. Here, we report the observation of a bulk DMI in GdFeCo amorphous ferrimagnets. The DMI is found to increase linearly with an increasing thickness of the ferrimagnetic layer, which is a clear signature of the bulk nature of DMI. We also found that the DMI is independent of the interface between the heavy metal and ferrimagnetic layer. This bulk DMI is attributed to an asymmetric distribution of the elemental content in the GdFeCo layer, with spatial inversion symmetry broken throughout the layer. We expect that our experimental identification of a bulk DMI will open up additional possibilities to exploit this interaction in a wide range of materials.

Original languageEnglish
Pages (from-to)685-690
Number of pages6
JournalNature Materials
Volume18
Issue number7
DOIs
Publication statusPublished - 2019 Jul 1

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ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Kim, D. H., Haruta, M., Ko, H. W., Go, G., Park, H. J., Nishimura, T., Kim, D. Y., Okuno, T., Hirata, Y., Futakawa, Y., Yoshikawa, H., Ham, W., Kim, S., Kurata, H., Tsukamoto, A., Shiota, Y., Moriyama, T., Choe, S. B., Lee, K. J., & Ono, T. (2019). Bulk Dzyaloshinskii–Moriya interaction in amorphous ferrimagnetic alloys. Nature Materials, 18(7), 685-690. https://doi.org/10.1038/s41563-019-0380-x