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Electric-field control of magnetic domain-wall velocity in ultrathin cobalt with perpendicular magnetization

Author

Listed:
  • D. Chiba

    (Institute for Chemical Research, Kyoto University, Gokasho
    PRESTO, Japan Science and Technology Agency)

  • M. Kawaguchi

    (Institute for Chemical Research, Kyoto University, Gokasho)

  • S. Fukami

    (NEC Corporation
    Center for Spintronics Integrated Systems, Tohoku University)

  • N. Ishiwata

    (NEC Corporation)

  • K. Shimamura

    (Institute for Chemical Research, Kyoto University, Gokasho)

  • K. Kobayashi

    (Institute for Chemical Research, Kyoto University, Gokasho)

  • T. Ono

    (Institute for Chemical Research, Kyoto University, Gokasho)

Abstract

Controlling the displacement of a magnetic domain wall is potentially useful for information processing in magnetic non-volatile memories and logic devices. A magnetic domain wall can be moved by applying an external magnetic field and/or electric current, and its velocity depends on their magnitudes. Here we show that the applying an electric field can change the velocity of a magnetic domain wall significantly. A field-effect device, consisting of a top-gate electrode, a dielectric insulator layer, and a wire-shaped ferromagnetic Co/Pt thin layer with perpendicular anisotropy, was used to observe it in a finite magnetic field. We found that the application of the electric fields in the range of ±2–3 MV cm−1 can change the magnetic domain wall velocity in its creep regime (106–103 m s−1) by more than an order of magnitude. This significant change is due to electrical modulation of the energy barrier for the magnetic domain wall motion.

Suggested Citation

  • D. Chiba & M. Kawaguchi & S. Fukami & N. Ishiwata & K. Shimamura & K. Kobayashi & T. Ono, 2012. "Electric-field control of magnetic domain-wall velocity in ultrathin cobalt with perpendicular magnetization," Nature Communications, Nature, vol. 3(1), pages 1-7, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1888
    DOI: 10.1038/ncomms1888
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