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Injection of Polarized Spins and Anti-Localization Caused by Slight Doping of Heavy Impurities into One End of Carbon Nanotubes

Published online by Cambridge University Press:  15 March 2011

Junji Haruyama ,
Izumi Takesue  and
Tetsuro Hasegawa
Junji Haruyama
Affiliation:
Aoyama Gakuin University, 6-16-1 Chitosedai, Setagaya, Tokyo 157-8572, JAPAN
Izumi Takesue
Affiliation:
Aoyama Gakuin University, 6-16-1 Chitosedai, Setagaya, Tokyo 157-8572, JAPAN
Tetsuro Hasegawa
Affiliation:
Aoyama Gakuin University, 6-16-1 Chitosedai, Setagaya, Tokyo 157-8572, JAPAN
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Abstract

Electrode atoms are slightly diffused, with only about 5% volume-ratio, into the top end of multi-walled carbon nanotubes (MWNTs), standing in nano-pores of porous Alumina membranes. Diffusion of light-mass materials (carbon and aluminum) leads to weak localization in the Altshuler-Aronov-Spivak (AAS) oscillations, which is qualitatively consistent with previous works on MWNTs. In contrast, we find that diffusion of heavy materials (gold and platinum) changes this weak localization into an anti-localization in the MWNT bulk. This effect is only observable when electrons are injected through the diffusion region, and undergo a φ-phase shift in their electron waves, caused by polarized injection of spin-flipped electrons due to spin-orbit interaction in the diffusion-region of the MWNT bulk.

Type
Article
Information
MRS Online Proceedings Library (OPL) , Volume 706: Symposium Z – Making Functional Materials with Nanotubes , 2001 , Z6.4.1
Copyright
Copyright © Materials Research Society 2002

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