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Phys. Rev. B 69, 153309 (2004) [4 pages]

Highly efficient spin filtering of ballistic electrons

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S. J. Steinmuller, T. Trypiniotis, W. S. Cho, A. Hirohata*, W. S. Lew, C. A. F. Vaz, and J. A. C. Bland†
Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom

Received 13 November 2003; published 22 April 2004

Spin dependent electron transport in hybrid Au/Co/Cu/NiFe/n-GaAs spin valve Schottky barrier structures was investigated using photoexcitation at various wavelengths. For excitation with the photon energy well above the Schottky barrier height we found a ∼2400% increase in helicity dependent photocurrent on switching the spin valve from parallel to antiparallel alignment. Our observations provide clear evidence for highly efficient spin filtering of spin polarized ballistic electrons.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.69.153309
DOI:
10.1103/PhysRevB.69.153309
PACS:
72.25.-b, 73.40.-c, 85.75.-d

*Present address; Department of Materials Science, Tohoku University, Sendai 980-8579, Japan.

†Corresponding author. Email address: jacb1@phy.cam.ac.uk

 
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