Spin-dependent internal photo-electron emission over metal–semiconductor junctions – a study with circularly polarised infrared radiation |
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Authors: | AER Malins JR Neal T-H Shen WY Liang |
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Institution: | (1) Joule Physics Laboratory, Institute for Materials Research, University of Salford, Salford, M5 4WT, UK, GB;(2) Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, UK, GB |
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Abstract: | The spin asymmetry of internal photo-electron emission over Schottky barriers has been investigated for Fe/GaAs (001) having
close-to-ideal current–voltage characteristics. Using a low-power circularly polarised YAG laser operated at its fundamental
frequency (λ=1064 nm) as well as a visible diode laser (λ=670 nm) we demonstrate that, by eliminating the photo-current due
to inter-band transitions in GaAs with the infrared source, a significant enhancement to the magnetic asymmetry could be achieved.
The bias dependence of the asymmetry was also measured. It was found that the values were considerably different for the photo-electrons
traversing the barriers in opposite directions.
Received: 15 November 2001 / Revised version: 23 March 2002 / Published online: 2 May 2002 |
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Keywords: | PACS: 73 25 +y 73 40 -c 75 50 -y 75 70 -i 85 75 -d |
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