T
Tomohiro Koyama
Researcher at Osaka University
Publications - 118
Citations - 2496
Tomohiro Koyama is an academic researcher from Osaka University. The author has contributed to research in topics: Magnetic domain & Magnetization. The author has an hindex of 26, co-authored 112 publications receiving 2172 citations. Previous affiliations of Tomohiro Koyama include University of Tokyo & Kyoto University.
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Journal ArticleDOI
Observation of the intrinsic pinning of a magnetic domain wall in a ferromagnetic nanowire
Tomohiro Koyama,Daichi Chiba,Daichi Chiba,Kohei Ueda,Kouta Kondou,Hironobu Tanigawa,Shunsuke Fukami,Teruaki Suzuki,Norikazu Ohshima,Nobuyuki Ishiwata,Yoshinobu Nakatani,Kensuke Kobayashi,Teruo Ono +12 more
TL;DR: Evidence is given that this intrinsic pinning determines the threshold, and thus that the adiabatic spin torque dominates the domain wall motion in a perpendicularly magnetized Co/Ni nanowire, to achieve robust operation and low energy consumption in spintronic devices.
Journal ArticleDOI
Control of Multiple Magnetic Domain Walls by Current in a Co/Ni Nano-Wire
Daichi Chiba,Gen Yamada,Tomohiro Koyama,Kohei Ueda,Hironobu Tanigawa,Shunsuke Fukami,Tetsuhiro Suzuki,Norikazu Ohshima,Nobuyuki Ishiwata,Yoshinobu Nakatani,Teruo Ono +10 more
TL;DR: In this paper, a series of magnetic domain walls were reproducibly shifted in the same direction by the current, keeping the distance between the walls almost the same, and the walls can be shifted back and forth depending on the direction of the pulsed currents.
Journal ArticleDOI
Domain Wall Motion Induced by Electric Current in a Perpendicularly Magnetized Co/Ni Nano-Wire
H. Tanigawa,Tomohiro Koyama,Gen Yamada,Daichi Chiba,Shinya Kasai,Shunsuke Fukami,Tetsuhiro Suzuki,Norikazu Ohshima,Nobuyuki Ishiwata,Yoshinobu Nakatani,Teruo Ono +10 more
TL;DR: In this article, the anomalous Hall effect was used to detect the domain wall motion induced by electric current in a Co/Ni nano-wire with perpendicular magnetic anisotropy, where the minimum threshold current density of approximately 5×1011 A/m2 was observed for the wire width of 70 nm.
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Weak antilocalization and conductance fluctuation in a submicrometer-sized wire of epitaxial Bi 2 Se 3
Sadashige Matsuo,Tomohiro Koyama,Kazutoshi Shimamura,T. Arakawa,Yoshitaka Nishihara,Daichi Chiba,Kensuke Kobayashi,Teruo Ono,Cui-Zu Chang,Ke He,Xucun Ma,Qi-Kun Xue +11 more
TL;DR: In this article, the phase-coherent transport in a submicrometer-sized Hall bar made of epitaxial Bi{}_{2}$Se${}_{3}$ thin film was investigated by probing the weak antilocalization (WAL) and the magnetoresistance fluctuation below 22 K.
Journal ArticleDOI
Microglial activation involved in morphine tolerance is not mediated by toll-like receptor 4.
TL;DR: Microglial activation caused by a mechanism independent of TLR4 is involved in the development of morphine tolerance, and minocycline attenuated theDevelopment of morphineolerance in mice.