Regensburg 2007 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 13: Poster 1
HL 13.65: Poster
Monday, March 26, 2007, 15:00–17:30, Poster A
Non-local spin-valve signal in magnetotransport measurements on p+-(Ga,Mn)As/n+-GaAs Esaki diode devices. — •Andreas Einwanger1, Mariusz Ciorga1, Janusz Sadowski1,2, Dieter Schuh1, Werner Wegscheider1, and Dieter Weiss1 — 1Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, D-93040 Regensburg, Germany — 2Present address: MAX-Lab, Lund University, SE-221 00, Lund, Sweden
We have fabricated devices to investigate all-electrical injection/detection of spin-polarized carriers from ferromagnetic (Ga,Mn)As layer into the non-magnetic GaAs layer in a lateral transport geometry. The Esaki diode structures p+-(Ga,Mn)As/n+-GaAs are used as injector/detector contacts to circumvent the problem of fast spin relaxation of holes injected from a p-type ferromagnet into GaAs. Under a reverse bias applied to such a structure spin-polarized electrons, with longer spin relaxation times than holes, tunnel from (Ga,Mn)As valence band through the depletion layer into GaAs conduction band [1]. We report on the first results of our magnetotransport experiments in a non-local lateral spin valve geometry.
[1]. M. Kohda et al., Jpn. J. Appl. Phys 40, L1274 (2001).