Two-barrier stability that allows low-power operation in current-induced domain-wall motion

Kab-Jin Kim, Ryo Hiramatsu, Tomohiro Koyama, Kohei Ueda, Yoko Yoshimura, Daichi Chiba, Kensuke Kobayashi, Yoshinobu Nakatani, Shunsuke Fukami, Michihiko Yamanouchi, Hideo Ohno, Hiroshi Kohno, Gen Tatara and Teruo Ono ()
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Kab-Jin Kim: Institute for Chemical Research, Kyoto University, Gokasho
Ryo Hiramatsu: Institute for Chemical Research, Kyoto University, Gokasho
Tomohiro Koyama: Institute for Chemical Research, Kyoto University, Gokasho
Kohei Ueda: Institute for Chemical Research, Kyoto University, Gokasho
Yoko Yoshimura: Institute for Chemical Research, Kyoto University, Gokasho
Daichi Chiba: Institute for Chemical Research, Kyoto University, Gokasho
Kensuke Kobayashi: Institute for Chemical Research, Kyoto University, Gokasho
Yoshinobu Nakatani: University of Electro-communications
Shunsuke Fukami: Center for Spintronics Integrated Systems, Tohoku University
Michihiko Yamanouchi: Center for Spintronics Integrated Systems, Tohoku University
Hideo Ohno: Center for Spintronics Integrated Systems, Tohoku University
Hiroshi Kohno: Graduate School of Engineering Science, Osaka University
Gen Tatara: Tokyo Metropolitan University
Teruo Ono: Institute for Chemical Research, Kyoto University, Gokasho

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: Abstract Energy barriers in magnetization reversal dynamics have long been of interest because the barrier height determines the thermal stability of devices as well as the threshold force triggering their dynamics. Especially in memory and logic applications, there is a dilemma between the thermal stability of bit data and the operation power of devices, because larger energy barriers for higher thermal stability inevitably lead to larger magnetic fields (or currents) for operation. Here we show that this is not the case for current-induced magnetic domain-wall motion induced by adiabatic spin-transfer torque. By quantifying domain-wall depinning energy barriers by magnetic field and current, we find that there exist two different pinning barriers, extrinsic and intrinsic energy barriers, which govern the thermal stability and threshold current, respectively. This unique two-barrier system allows low-power operation with high thermal stability, which is impossible in conventional single-barrier systems.

Date: 2013
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DOI: 10.1038/ncomms3011

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