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Fukaya, Yuki; Kawasuso, Atsuo*; Ichimiya, Ayahiko*; Hyodo, Toshio*
Journal of Physics D; Applied Physics, 52(1), p.013002_1 - 013002_19, 2019/01
Times Cited Count:16 Percentile:17.99(Physics, Applied)no abstracts in English
Hyodo, Toshio*; Wada, Ken*; Mochizuki, Izumi*; Kimura, Masao*; Toge, Nobukazu*; Shidara, Tetsuo*; Fukaya, Yuki; Maekawa, Masaki*; Kawasuso, Atsuo*; Iida, Shimpei*; et al.
Journal of Physics; Conference Series, 791(1), p.012003_1 - 012003_8, 2017/02
Times Cited Count:3 Percentile:72.26(Physics, Multidisciplinary)no abstracts in English
Mochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Maekawa, Masaki*; Kawasuso, Atsuo*; Shidara, Tetsuo*; Asakura, Kiyotaka*; Hyodo, Toshio*
Hyomen Kagaku, 37(9), p.451 - 456, 2016/09
no abstracts in English
Mochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Maekawa, Masaki; Kawasuso, Atsuo; Shidara, Tetsuo*; Asakura, Kiyotaka*; Hyodo, Toshio*
Physical Chemistry Chemical Physics, 18(10), p.7085 - 7092, 2016/03
Times Cited Count:22 Percentile:67.52(Chemistry, Physical)no abstracts in English
Kawasuso, Atsuo
Hoshasen To Sangyo, (139), p.18 - 22, 2015/12
no abstracts in English
Li, H.; Maekawa, Masaki; Kawasuso, Atsuo; Tanimura, Naoki*
Journal of Physics; Condensed Matter, 27(24), p.246001_1 - 246001_5, 2015/06
Times Cited Count:7 Percentile:30.61(Physics, Condensed Matter)Zhang, H. J.; Yamamoto, Shunya; Gu, B.; Li, H.; Maekawa, Masaki; Fukaya, Yuki; Kawasuso, Atsuo
Physical Review Letters, 114(16), p.166602_1 - 166602_5, 2015/04
Times Cited Count:56 Percentile:89.83(Physics, Multidisciplinary)Charge-to-spin conversion induced by the Rashba-Edelstein effect was directly observed for the first time in samples with no magnetic layer. A spin-polarized positron beam was used to probe the spin polarization of the outermost surface electrons of Bi/Ag/AlO
and Ag/Bi/Al
O
when charge currents were only associated with the Ag layers. An opposite surface spin polarization was found between Bi/Ag/Al
O
and Ag/Bi/Al
O
samples with the application of a charge current in the same direction. The surface spin polarizations of both systems decreased exponentially with the outermost layer thickness, suggesting the occurrence of spin diffusion from the Bi/Ag interface to the outermost surfaces. This work provides a new technique to measure spin diffusion length.
Li, X. F.*; Chen, Z. Q.*; Liu, C.*; Zhang, H.; Kawasuso, Atsuo
Journal of Applied Physics, 117(8), p.085706_1 - 085706_6, 2015/02
Times Cited Count:23 Percentile:66.10(Physics, Applied)Vacancy-type defects in C-implanted GaN were probed using a slow positron beam. The increase of Doppler broadening S parameter indicates introduction of arge vacancy clusters. Post-implantation annealing at temperatures up to 800
C makes these vacancy clusters to agglomerate into microvoids. The vacancy clusters or microvoids show high thermal stability, and they are only partially removed after annealing up to 1000
C. Amorphous regions are observed by high resolution transmission electron microscopy measurement, which directly confirms that amorphization is induced by C
-implantation. The disordered GaN lattice is possibly due to special feature of carbon impurities, which enhance the damage buildup during implantation.
Kawasuso, Atsuo
Yodenshi Kagaku, (4), p.9 - 22, 2015/02
In this article, I report, the spin polarization of positrons emitted from radioisotopes, the development of spin-polarized beams, the fundamental aspects of spin-polarized positron annihilation method, and, the investigation of current-induced spin polarization on metal surfaces through the spin-polarized positronium annihilation.
Maekawa, Masaki; Zhang, H.; Li, H.; Fukaya, Yuki; Kawasuso, Atsuo
JJAP Conference Proceedings, Vol.2 (Internet), p.011305_1 - 011305_7, 2014/11
Maekawa, Masaki; Wada, Ken*; Fukaya, Yuki; Kawasuso, Atsuo; Mochizuki, Izumi*; Shidara, Tetsuo*; Hyodo, Toshio*
European Physical Journal D, 68(6), p.165_1 - 165_6, 2014/06
Times Cited Count:18 Percentile:66.53(Optics)Fukaya, Yuki; Maekawa, Masaki; Kawasuso, Atsuo; Mochizuki, Izumi*; Wada, Ken*; Shidara, Tetsuo*; Ichimiya, Ayahiko*; Hyodo, Toshio*
Applied Physics Express, 7(5), p.056601_1 - 056601_4, 2014/05
Times Cited Count:19 Percentile:60.30(Physics, Applied)no abstracts in English
Fukaya, Yuki; Maekawa, Masaki; Mochizuki, Izumi*; Wada, Ken*; Hyodo, Toshio*; Kawasuso, Atsuo
Journal of Physics; Conference Series, 505, p.012005_1 - 012005_6, 2014/04
Times Cited Count:1 Percentile:49.85(Physics, Applied)no abstracts in English
Maekawa, Masaki; Fukaya, Yuki; Zhang, H.; Li, H.; Kawasuso, Atsuo
Journal of Physics; Conference Series, 505, p.012033_1 - 012033_4, 2014/04
Times Cited Count:7 Percentile:90.53(Physics, Applied)Hyodo, Toshio*; Fukaya, Yuki; Maekawa, Masaki; Mochizuki, Izumi*; Wada, Ken*; Shidara, Tetsuo*; Ichimiya, Ayahiko*; Kawasuso, Atsuo
Journal of Physics; Conference Series, 505(1), p.012001_1 - 012001_5, 2014/04
Times Cited Count:9 Percentile:93.28(Physics, Applied)no abstracts in English
Zhang, H.; Yamamoto, Shunya; Fukaya, Yuki; Maekawa, Masaki; Li, H.; Kawasuso, Atsuo; Seki, Takeshi*; Saito, Eiji*; Takanashi, Koki*
Scientific Reports (Internet), 4, p.4844_1 - 4844_5, 2014/04
Times Cited Count:43 Percentile:82.65(Multidisciplinary Sciences)Fukaya, Yuki; Mochizuki, Izumi*; Maekawa, Masaki; Wada, Ken*; Hyodo, Toshio*; Matsuda, Iwao*; Kawasuso, Atsuo
Physical Review B, 88(20), p.205413_1 - 205413_4, 2013/11
Times Cited Count:67 Percentile:90.32(Materials Science, Multidisciplinary)no abstracts in English
Kawasuso, Atsuo; Fukaya, Yuki; Maekawa, Masaki; Zhang, H.; Seki, Takeshi*; Yoshino, Tatsuro*; Saito, Eiji*; Takanashi, Koki*
Journal of Magnetism and Magnetic Materials, 342, p.139 - 143, 2013/09
Times Cited Count:21 Percentile:63.69(Materials Science, Multidisciplinary)Transversely spin-polarized positrons were injected near Pt and Au surfaces under an applied electric current. The three-photon annihilation of spin-triplet positronium, which was emitted from the surfaces into vacuum, was observed. When the positron spin polarization was perpendicular to the current direction, the maximum asymmetry of the three-photon annihilation intensity was observed upon current reversal for the Pt surfaces, whereas it was significantly reduced for the Au surface. The experimental results suggest that electrons near the Pt surfaces were in-plane and transversely spin-polarized with respect to the direction of the electric current. The maximum electron spin polarization was estimated to be more than 0.01 (1%).
Maekawa, Masaki; Fukaya, Yuki; Yabuuchi, Atsushi; Mochizuki, Izumi; Kawasuso, Atsuo
Nuclear Instruments and Methods in Physics Research B, 308, p.9 - 14, 2013/08
Times Cited Count:15 Percentile:72.26(Instruments & Instrumentation)Maekawa, Masaki; Kawasuso, Atsuo
Journal of Physics; Conference Series, 443, p.012041_1 - 012041_4, 2013/06
Times Cited Count:0 Percentile:0.00(Physics, Atomic, Molecular & Chemical)