Spin-dependent internal photo-electron emission over metal-semiconductor junctions: a study with circularly polarised infrared radiation

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 (*l=1064 nm) as well as a visible diode...

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Veröffentlicht in:	Applied physics. B, Lasers and optics Lasers and optics, 2002-05, Vol.74 (7-8), p.729-733
Hauptverfasser:	MALINS, A. E. R, NEAL, J. R, SHEN, T.-H, LIANG, W. Y
Format:	Artikel
Sprache:	eng
Schlagworte:	Asymmetry Barriers Circularity Condensed matter: electronic structure, electrical, magnetic, and optical properties Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Electronic transport in interface structures Emission analysis Exact sciences and technology Gallium arsenide Infrared Interfacial magnetic properties (multilayers, magnetic quantum wells, superlattices, magnetic heterostructures) Lasers Magnetic properties and materials Magnetic properties of surface, thin films and multilayers Metal-semiconductor-metal structures Physics Semiconductor lasers Surface conductivity and carrier phenomena
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Zusammenfassung:	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 (l=1064 nm) as well as a visible diode laser (l=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.
ISSN:	0946-2171 1432-0649
DOI:	10.1007/s003400200856