Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 31: Poster II

HL 31.12: Poster

Dienstag, 26. Februar 2008, 16:30–19:00, Poster D

Optical detection of spin polarisation in a lateral spin-transport device with (Ga,Mn)As injecting contacts — •Andreas Maurer, Michael Griesbeck, Thomas Kufner, Andreas Einwanger, Tobias Korn, Mariusz Ciorga, Dieter Schuh, Werner Wegscheider, Dieter Weiss, and Christian Schüller — Uni Regensburg

Understanding of spi-polarised injection into semiconductor materials and resulting spin-polarised transport is a crucial factor in developing future spintronic devices.

Here we report on the design and fabrication of a lateral spin injection/transport device using ferromagnetic GaMnAs contacts as spin injectors. As a channel we use slightly n-doped GaAs (n = 2 × 10¹⁶ cm⁻³), where extremely long spin-lifetimes (> 100 ns) could be observed previously [1]. In order to be able to detect the spin polarization in the channel via optical microscopy, channel lengths of several hundred µm are used. In this device the lateral spin injection shall be monitored via Kerr microscopy in analogy to the experiment of Crooker et al. [2].

In this contribution, we report about the design, fabrication and characterisation of the spin injectors and the measurements of the spin lifetime in the channel material, employing time resolved Kerr experiments. We acknowledge financial support by the Deutsche Forschungsgemeinschaft via SFB689.

[1] Kikkawa et al., PRL 80 4313 (1998)

[2] Crooker et al., Science 309 2191 (2005)