Large thermal stability independent of critical current of domain wall motion in Co/Ni nanowires with step pinning sites

Shunsuke Fukami; Tetsuhiro Suzuki; Kiyokazu Nagahara; Norikazu Ohshima; Nobuyuki Ishiwata

doi:10.1063/1.3518046

Large thermal stability independent of critical current of domain wall motion in Co/Ni nanowires with step pinning sites

Shunsuke Fukami, Tetsuhiro Suzuki, Kiyokazu Nagahara, Norikazu Ohshima, Nobuyuki Ishiwata

RIEC - Computing System Platforms Division

NEC Corporation

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17 Citations (Scopus)

Abstract

The relation between critical current, critical field, and thermal stability of domain wall (DW) trapped at step pinning sites was studied using Co/Ni nanowires with perpendicular magnetic anisotropy (PMA). A sharp step structure was fabricated, which increased the critical field of DW motion, while the critical current was independent of the critical field. Also, the derived thermal stability (ΔE/ k_B T) for the step samples was much more than 60. These results indicate that the DW motion in PMA nanowires has potential for memory devices with both a small driving current and large thermal stability.

Original language	English
Article number	113914
Journal	Journal of Applied Physics
Volume	108
Issue number	11
DOIs	https://doi.org/10.1063/1.3518046
Publication status	Published - 2010 Dec 1

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abstract = "The relation between critical current, critical field, and thermal stability of domain wall (DW) trapped at step pinning sites was studied using Co/Ni nanowires with perpendicular magnetic anisotropy (PMA). A sharp step structure was fabricated, which increased the critical field of DW motion, while the critical current was independent of the critical field. Also, the derived thermal stability (ΔE/ kB T) for the step samples was much more than 60. These results indicate that the DW motion in PMA nanowires has potential for memory devices with both a small driving current and large thermal stability.",

author = "Shunsuke Fukami and Tetsuhiro Suzuki and Kiyokazu Nagahara and Norikazu Ohshima and Nobuyuki Ishiwata",

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T1 - Large thermal stability independent of critical current of domain wall motion in Co/Ni nanowires with step pinning sites

AU - Fukami, Shunsuke

AU - Suzuki, Tetsuhiro

AU - Nagahara, Kiyokazu

AU - Ohshima, Norikazu

AU - Ishiwata, Nobuyuki

N1 - Funding Information: The authors would like to thank Professor T. Ono and Dr. D. Chiba of Kyoto University and Professor Y. Nakatani of University of Electro-Communications for the fruitful discussion. A portion of this work was supported by New Energy and Industrial Technology Development Organization Spintronics nonvolatile devices project.

PY - 2010/12/1

Y1 - 2010/12/1

N2 - The relation between critical current, critical field, and thermal stability of domain wall (DW) trapped at step pinning sites was studied using Co/Ni nanowires with perpendicular magnetic anisotropy (PMA). A sharp step structure was fabricated, which increased the critical field of DW motion, while the critical current was independent of the critical field. Also, the derived thermal stability (ΔE/ kB T) for the step samples was much more than 60. These results indicate that the DW motion in PMA nanowires has potential for memory devices with both a small driving current and large thermal stability.

AB - The relation between critical current, critical field, and thermal stability of domain wall (DW) trapped at step pinning sites was studied using Co/Ni nanowires with perpendicular magnetic anisotropy (PMA). A sharp step structure was fabricated, which increased the critical field of DW motion, while the critical current was independent of the critical field. Also, the derived thermal stability (ΔE/ kB T) for the step samples was much more than 60. These results indicate that the DW motion in PMA nanowires has potential for memory devices with both a small driving current and large thermal stability.

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Large thermal stability independent of critical current of domain wall motion in Co/Ni nanowires with step pinning sites

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