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Proceedings Paper

Optically oriented electron spin transmission across ferromagnet/semiconductor interfaces
Author(s): T. Taniyama; I. Suzuki; E. Wada; Y. Shirahata; T. Naito; M. Itoh; M. Yamaguchi
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Paper Abstract

Electron spin transmission across ferromagnetic metal/semiconductor interfaces with different ferromagnetic contacts, i.e., Fe and FeGa, is studied using optical spin orientation method. The bias dependence of spin dependent photocurrent, which is the difference between the photocurrents excited with left- and right- handed circularly polarized lights, is found to show a dip-like feature at -0.058 and 0.021 V for Fe and FeGa contacts, respectively. The origin of the bias dependence of the spin dependent photocurrent is discussed on the basis of the Breit-Wigner type resonant tunneling process via interface resonant states, comparing the results for the both contacts. The results also indicate that the control of interface states is crucial to achieve efficient spin filtering effect at the ferromagnet/semiconductor interfaces.

Paper Details

Date Published: 15 September 2011
PDF: 8 pages
Proc. SPIE 8100, Spintronics IV, 81000A (15 September 2011); doi: 10.1117/12.892386
Show Author Affiliations
T. Taniyama, Tokyo Institute of Technology (Japan)
Japan Science and Technology Agency (Japan)
I. Suzuki, Tokyo Institute of Technology (Japan)
E. Wada, Tokyo Institute of Technology (Japan)
Y. Shirahata, Tokyo Institute of Technology (Japan)
T. Naito, Tokyo Institute of Technology (Japan)
M. Itoh, Tokyo Institute of Technology (Japan)
M. Yamaguchi, Nagoya Univ. (Japan)

Published in SPIE Proceedings Vol. 8100:
Spintronics IV
Henri-Jean M. Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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