Naoto Yamashita
Kyoto University
Applied Physics Letters | 2017
Soobeom Lee; Naoto Yamashita; Yuichiro Ando; Shinji Miwa; Yoshishige Suzuki; Hayato Koike; Masashi Shiraishi
The temperature evolution of spin relaxation time, τsf, in degenerate silicon (Si)-based lateral spin valves is investigated by means of the Hanle effect measurements. τsf at 300 K is estimated to be 1.68 ± 0.03 ns and monotonically increased with decreasing temperature down to 100 K. Below 100 K, in contrast, it shows almost a constant value of ca. 5 ns. The temperature dependence of the conductivity of the Si channel shows a similar behavior to that of the τsf, i.e., monotonically increasing with decreasing temperature down to 100 K and a weak temperature dependence below 100 K. The temperature evolution of conductivity reveals that electron scattering due to magnetic impurities is negligible. A comparison between τsf and momentum scattering time reveals that the dominant spin scattering mechanism in the Si is the Elliott-Yafet mechanism, and the ratio of the momentum scattering time to the τsf attributed to nonmagnetic impurities is approximately 3.77 × 10−6, which is more than two orders of magnitude ...
Archive | 2011
Takashi Mukai; 孝志 向井; Taichi Sakamoto; 太地 坂本; Tetsuo Sakai; 哲男 境; Kunihiko Tani; 邦彦 谷; Naoto Yamashita; 直人 山下; Koichiro Ikeda; 幸一郎 池田
Physical review applied | 2018
Naoto Yamashita; Yuichiro Ando; Hayato Koike; Shinji Miwa; Yoshishige Suzuki; Masashi Shiraishi
Journal of The Electrochemical Society | 2018
Katsuya Kimura; Taichi Sakamoto; Takashi Mukai; Yuta Ikeuchi; Naoto Yamashita; Keiichiro Onishi; Keiichi Asami; Masahiro Yanagida
The Japan Society of Applied Physics | 2017
Soobeom Lee; Naoto Yamashita; Yuichiro Ando; Shinji Miwa; Yoshishige Suzuki; Hayato Koike; Masashi Shiraishi
The Japan Society of Applied Physics | 2017
Naoto Yamashita; Sakamoto Taichi; Iwanari Daichi; Yuta Ikeuchi; Yoshida Kazuma; Tanaka Kazuyoshi; Mukai Takashi
Archive | 2017
Naoto Yamashita; Yuichiro Ando; Hayato Koike; Shinji Miwa; Yoshishige Suzuki; Masashi Shiraishi
The Japan Society of Applied Physics | 2016
Naoto Yamashita; Yuichiro Ando; Hayato Koike; Tomoyuki Sasaki; Shinji Miwa; Kazuhito Tanaka; Yoshishige Suzuki; Masashi Shiraishi
The Japan Society of Applied Physics | 2016
Soobeom Lee; Naoto Yamashita; Yuichiro Ando; Shinji Miwa; Yoshishige Suzuki; Hayato Koike; Masashi Shiraishi
18th International Meeting on Lithium Batteries (June 19-24, 2016) | 2016
Masahiro Yanagida; Takashi Mukai; Yuuta Ikeuchi; Taichi Sakamoto; Naoto Yamashita; Hideaki Tanaka
