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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：51 Percentile：89.71(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/Al
O
and Ag/Bi/AlO when charge currents were only associated with the Ag layers. An opposite surface spin polarization was found between Bi/Ag/AlO and Ag/Bi/AlO 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.
Hirade, Tetsuya
Materials Science Forum, 445-446, p.234 - 238, 2004/02
Positronium (Ps) formation mechanism by shallowly localized long-lived electrons and positrons at low temperatures explained successfully the Ps formation enhancement at low temperatures observed in polymers and molecular solids. The expected phenomena by this Ps formation mechanism, such as effects by visible light exposure, beautiful relation between the density of shallowly localized electrons and the Ps formation and delayed Ps formation were observed. Some possibilities of application of this new Ps formation, such as a new idea of observing spin polarized positrons by this Ps formation, will be given. The shallowly localized long-lived electrons can be polarized when they are placed in magnetic field at very low temperatures. It is probably possible to see the polarity of positrons by the Ps formation with these polarized electrons. The detail of the idea will be introduced. It will be given as an invited talk.
Hirade, Tetsuya; Kumada, Takayuki
Materials Science Forum, 445-446, p.301 - 303, 2004/02
Positrons injected in molecular solids or polymers will have the positronium formation around a terminal spur of positron track, so-called positron spur, with active species in the positron spur, such as excess electrons. In this case, the electrons are not polarized. At low enough temperatures, long-lived shallowly localized electrons are accumulated by irradiation in darkness, and positrons will have a next chance to form positronium with these long-lived shallowly localized electrons. For these electrons, it is possible to make them to be polarized by applying magnetic field at very low temperatures. We successfully observed the effect of the positronium formation reaction of polarized positron and polarized electrons.
Maekawa, Masaki; Zhou, K.*; Fukaya, Yuki; Zhang, H.; Li, H.; Kawasuso, Atsuo
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no abstracts in English
Ge-Ga source with high production efficiency by an improved metal galium targetMaekawa, Masaki; Zhou, K.*; Fukaya, Yuki; Zhang, H.; Li, H.; Kawasuso, Atsuo
no journal, ,
no abstracts in English
Maekawa, Masaki; Zhou, K.*; Fukaya, Yuki; Zhang, H.; Li, H.; Kawasuso, Atsuo
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no abstracts in English
Abe, Hiroshi; Maekawa, Masaki; Zhou, K.*; Kawasuso, Atsuo
no journal, ,
no abstracts in English
