Berlin 2005 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 16: Poster Ia
HL 16.13: Poster
Freitag, 4. März 2005, 16:30–19:00, Poster TU E
Spin-dependent localization effects in GaAs:Mn/MnAs granular paramagnetic-ferromagnetic hybrids at low temperatures — •C. Michel1, C. Thien1, S. Ye1, P.J. Klar1, W. Heimbrodt1, S.D. Baranovskii1, P. Thomas1, and B. Goldlücke2 — 1Department of Physics and Materials Science Center, Philipps-University of Marburg, Germany — 2MPI for Computer Science, Saarbrücken, Germany
We compare the magneto-transport in paramagnetic-ferromagnetic GaAs:Mn/MnAs granular hybrids and paramagnetic GaAs:Mn reference samples. The differences in the hole transport between the two systems at low temperatures arise due to carrier localization effects at the cluster–matrix interface in the hybrids. The localization is caused by a Schottky barrier formation at the interface as well as spin-dependent shifts of the hole bands caused by the stray field of the ferromagnetic clusters. The application of an external magnetic field leads to a delocalization of the carriers and thus a negative magneto-resistance effect. These effects can be simulated using a network model approach.