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

D. Chiba (), M. Kawaguchi, S. Fukami, N. Ishiwata, K. Shimamura, K. Kobayashi and T. Ono
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D. Chiba: Institute for Chemical Research, Kyoto University, Gokasho
M. Kawaguchi: Institute for Chemical Research, Kyoto University, Gokasho
S. Fukami: NEC Corporation
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

Nature Communications, 2012, vol. 3, issue 1, 1-7

Abstract: 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.

Date: 2012
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DOI: 10.1038/ncomms1888

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