Regensburg 2004 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 44: Poster II

HL 44.10: Poster

Donnerstag, 11. März 2004, 16:30–19:00, Poster A

Optical and Electronic Methods to Observe Spin Injection — •Fang-Yuh Lo¹, Dirk Reuter¹, Andreas Wieck¹, Ellen Schuster², and Aleksey Dremin³ — ¹Ruhr-Universitaet Bochum, Lehrstuhl fuer Angewandte Festkoerperphysik, Universitaetsstr. 150, D-44780 Bochum — ²Universitaet Duisburg-Essen, Laboratorium fuer Angewandte Physik, Lotharstr. 1, D-47048 Duisburg — ³Universitaet Dortmund, Experimentelle Physik II , Otto-Hahn-Strasse 4, D-44227 Dortmund

The spin injection from magnetic metal films into semiconductors attracts great interests since it is proposed in the early 1990s. There are two possibilities to investigate this phenomenon, optical or electronic. Due to the optical transition rule, the emitted light will have either left or right circularly-polarization with respect to the different kinds of spins of the injected carriers. The electronic way is to look at the differences of resistance with the different spin alignment of the magnetic electrodes, which are used to inject carriers. There are some reported works, and most of them are using optical methods. In this work, we apply both the optical and electronic method to investigate spin-injection phenomenon. The optical method is to analyze the degree of the polarization of the emission from semiconductor quantum structures. Both of the focused ion beam implantation and cleaved-edge overgrowth techniques are applied to form micro- and nano-structures for the electronic observations of spin injection into semiconductors.