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Interface control of the magnetic chirality in CoFeB/MgO heterostructures with heavy-metal underlayers

Author

Listed:
  • Jacob Torrejon

    (National Institute for Materials Science)

  • Junyeon Kim

    (National Institute for Materials Science)

  • Jaivardhan Sinha

    (National Institute for Materials Science)

  • Seiji Mitani

    (National Institute for Materials Science)

  • Masamitsu Hayashi

    (National Institute for Materials Science)

  • Michihiko Yamanouchi

    (Center for Spintronics Integrated Systems, Tohoku University
    Research Institute of Electrical Communication, Tohoku University)

  • Hideo Ohno

    (Center for Spintronics Integrated Systems, Tohoku University
    Research Institute of Electrical Communication, Tohoku University
    WPI Advanced Institute for Materials Research, Tohoku University)

Abstract

Recent advances in the understanding of spin orbital effects in ultrathin magnetic heterostructures have opened new paradigms to control magnetic moments electrically. The Dzyaloshinskii–Moriya interaction (DMI) is said to play a key role in forming a Néel-type domain wall that can be driven by the spin Hall torque. Here we show that the strength and sign of the DMI can be changed by modifying the adjacent heavy-metal underlayer (X) in perpendicularly magnetized X/CoFeB/MgO heterostructures. The sense of rotation of a domain wall spiral is reversed when the underlayer is changed from Hf, Ta to W and the strength of DMI varies as the filling of 5d orbitals, or the electronegativity, of the heavy-metal layer changes. The DMI can even be tuned by adding nitrogen to the underlayer, thus allowing interface engineering of the magnetic texture in ultrathin magnetic heterostructures.

Suggested Citation

  • Jacob Torrejon & Junyeon Kim & Jaivardhan Sinha & Seiji Mitani & Masamitsu Hayashi & Michihiko Yamanouchi & Hideo Ohno, 2014. "Interface control of the magnetic chirality in CoFeB/MgO heterostructures with heavy-metal underlayers," Nature Communications, Nature, vol. 5(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5655
    DOI: 10.1038/ncomms5655
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    Cited by:

    1. Lijun Zhu & Daniel C. Ralph, 2023. "Strong variation of spin-orbit torques with relative spin relaxation rates in ferrimagnets," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    2. Qianbiao Liu & Long Liu & Guozhong Xing & Lijun Zhu, 2024. "Asymmetric magnetization switching and programmable complete Boolean logic enabled by long-range intralayer Dzyaloshinskii-Moriya interaction," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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