Current-Driven Motion of Domain Boundaries between Skyrmion Lattice and Helical Magnetic Structure
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- Kiyou Shibata
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
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- Toshiaki Tanigaki
- Research and Development Group, Hitachi Ltd., Hatoyama 350-0395, Japan
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- Tetsuya Akashi
- Research and Development Group, Hitachi Ltd., Hatoyama 350-0395, Japan
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- Hiroyuki Shinada
- Research and Development Group, Hitachi Ltd., Hatoyama 350-0395, Japan
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- Ken Harada
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
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- Kodai Niitsu
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
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- Daisuke Shindo
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
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- Naoya Kanazawa
- Department of Applied Physics, the University of Tokyo, Tokyo 113-8656, Japan
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- Yoshinori Tokura
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
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- Taka-hisa Arima
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
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説明
To utilize magnetic skyrmions, nanoscale vortex-like magnetic structures, experimental elucidation of their dynamics against current application in various circumstances such as in confined structure and mixture of different magnetic phases is indispensable. Here, we investigate the current-induced dynamics of the coexistence state of magnetic skyrmions and helical magnetic structure in a thin plate of B20-type helimagnet FeGe in terms of in situ real-space observation using Lorentz transmission electron microscopy. Current pulses with various heights and widths were applied, and the change of the magnetic domain distribution was analyzed using a machine-learning technique. The observed average driving direction of the two-magnetic-state domain boundary is opposite to the applied electric current, indicating ferromagnetic s-d exchange coupling in the spin-transfer torque mechanism. The evaluated driving distance tends to increase with increasing the pulse duration time, current density (1 × 10
収録刊行物
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- Nano Letters
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Nano Letters 18 (2), 929-933, 2018-01-22
American Chemical Society (ACS)