Dresden 2009 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 12: Spin controlled transport I
HL 12.1: Talk
Tuesday, March 24, 2009, 09:30–09:45, BEY 81
Electrical detection of coherent spin currents across an Fe/GaAs Schottky contact — •I. Burkart1,2, C. Schwark1,2, G. Güntherodt1,2, C. Adelmann3, C.J. Palmstrøm3,4, X. Lou5, P.A. Crowell5, and B. Beschoten1,2 — 1Physikalisches Institut IIA, RWTH Aachen University, Templergraben 55, 52056 Aachen, and JARA-Fundamentals of Future Information Technology, Germany — 2Virtual Institute for Spin Electronics (ViSel), Aachen - Jülich - Göttingen — 3Department of Chemical Engineering and Material Science, University of Minnesota, Minneapolis 55455, USA — 4Departments of Electrical and Computer Engineering and Materials, University of California, Santa Barbara, CA 93106, USA — 5School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
Most previous experiments on electrical detection of spin currents in ferromagnet/semiconductor devices focus on the DC transport regime. Here, we present a new time-resolved method, which allows to electrically probe coherent spin currents across an Fe/GaAs Schottky contact, after optical excitation by circularly polarized laser pulses. Coherent spin precession can be identified in the magnetic-field dependent photo-current using resonant spin amplification. Based on this technique we are able to observe multiple Larmor precessions which can be associated with electron spin precession in the GaAs layer.
Work supported by BMBF, HGF and DFG.