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Hou, D.*; Qiu, Z.*; Harii, Kazuya; Kajiwara, Yosuke*; Uchida, Kenichi*; Fujikawa, Yasunori*; Nakayama, Hiroyasu*; Yoshino, Tatsuro*; An, Toshu*; Ando, Kazuya*; et al.
Applied Physics Letters, 101(4), p.042403_1 - 042403_4, 2012/07
Times Cited Count：76 Percentile：92.13(Physics, Applied)Inverse spin Hall effect has been investigated in bismuth(Bi)/permalloy(Py) bilayer films by using the spin pumping at room temperature. From the ferromagnetic-resonance-spectrum linewidth data, Bi is proved to be a good spin sink in our structure. We measured inverse spin Hall voltage and conductance of the Bi/Py bilayer and found that the inverse spin Hall current, 
, decreases with increasing the Bi thickness, which is in contrast to the former understanding in similar bilayer systems, e.g., Pt/Py. We constructed a model to explain the thickness dependence of quantitatively, in which spin transport modulation near Bi/Py interface is considered.
Fe
/Pt filmsNakayama, Hiroyasu*; Ando, Kazuya*; Harii, Kazuya; Yoshino, Tatsuro*; Takahashi, Ryo*; Kajiwara, Yosuke*; Uchida, Kenichi*; Fujikawa, Yasunori*; Saito, Eiji
Physical Review B, 85(14), p.144408_1 - 144408_7, 2012/04
Times Cited Count：192 Percentile：97.97(Materials Science, Multidisciplinary)Geometric effects on the inverse spin Hall effect (ISHE) induced by the spin pumping driven by the ferromagnetic resonance (FMR) have been investigated quantitatively. We measured the FMR spectra and the electromotive force induced by the ISHE with changing the size and the thickness in NiFe/Pt films. The intensity of generated charge currents due to the ISHE changes systematically with changing the film geometry. The experimental results show a clear difference between NiFe and Pt thickness dependence of the ISHE induced by the spin pumping.
Qiu, Z.*; Kajiwara, Yosuke*; Ando, Kazuya*; Fujikawa, Yasunori*; Uchida, Kenichi*; Tashiro, Takaharu*; Harii, Kazuya*; Yoshino, Tatsuro*; Saito, Eiji
Applied Physics Letters, 100(2), p.022402_1 - 022402_3, 2012/01
Times Cited Count：31 Percentile：75.44(Physics, Applied)In a simple all-oxide system, spin pumping driven by spin wave resonances have been investigated by using the inverse spin-Hall effect (ISHE). In a lanthanum doped yttrium iron garnet (La:YIG)/indium tin oxide (ITO) bilayer film, the spin pumping generates and injects a spin current into the ITO layer, and an electromotive force signal is observed via the ISHE. The electromotive forces were measured depend on the out-of-plane magnetic-field-angle and the microwave excitation power, which were consistent with the theoretical prediction of the ISHE. The realization of the all-oxide spin pumping system extends possibilities for the oxide spintronics.
Yoshino, Yoko; Takarabe, Kenichi*; Ishii, Masashi*; Katayama, Yoshinori; Shimomura, Osamu
Physica B; Condensed Matter, 273-274, p.781 - 783, 1999/12
Times Cited Count：1 Percentile：8.71(Physics, Condensed Matter)DX state is strongly localized. This nature could be investigated by observing relaxation process of localized electrons to emptied inner shells. We have found two different optical ionization process of the DX center in Al
Ga
As:Se (x=0.33,
(cm
)) by using synchrotron radiation. They are tentatively assigned to be a direct lift of an inner-shell electron to the conduction band (CB) followed by a capture of an electron at the DX center to the emptied inner shell 
K-edge
and the Auger ionization of one electron of the DX center to the CB followed by a capture of another electron to the emptied inner shell K-edge
.
Kimura, Toyoaki; Kurihara, Kenichi; Kawamata, Yoichi; Akiba, K.*; ; Terakado, Tsunehisa; Yoshino, Ryuji
Fusion Technology, 32(3), p.404 - 415, 1997/11
no abstracts in English
Yamamoto, Ken; Kobori, Tetsuo; Kanegae, Naomichi; Ozawa, Kenji; Komiya, Kazuyoshi; Tsubota, Toshihide; Nakashima, Fumiaki; Noda, Kimio; Suzuki, Takeo; Yoshino, Kenichi; et al.
PNC TN2450 93-001, 190 Pages, 1993/03
no abstracts in English
Azumi, Masafumi; Hasegawa, Mitsuru*; *; Kurihara, Kenichi; Nakamura, Yukiharu; Nishio, Satoshi; Shimomura, Yasuo; Shinya, K.*; Sugihara, Masayoshi; *; et al.
JAERI-M 92-041, 100 Pages, 1992/03
no abstracts in English
Ninomiya, Hiromasa; Hosogane, Nobuyuki; Yoshino, Ryuji; Ushigusa, Kenkichi; Kamada, Yutaka; Kikuchi, Mitsuru; Kimura, Toyoaki; Kurihara, Kenichi; Tsuji, Shunji; Naito, Osamu; et al.
Kaku Yugo Kenkyu, 65(SPECIAL ISSUE), p.13 - 26, 1991/03
no abstracts in English
; Kimura, Toyoaki; Yonekawa, Izuru; Kurihara, Kenichi; ; ; Hosogane, Nobuyuki; Yoshino, Ryuji; Ninomiya, Hiromasa; Kawamata, Yoichi; et al.
Fusion Engineering and Design, 5, p.69 - 84, 1987/00
Times Cited Count：9 Percentile：66.63(Nuclear Science & Technology)no abstracts in English
