DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2010 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

HL: Fachverband Halbleiterphysik

HL 33: Poster I: Transport, including Magnetic-Field Effects

HL 33.13: Poster

Tuesday, March 23, 2010, 18:30–20:30, Poster D1

Towards a local spin-valve signal in all-semiconductor lateral spin injection devices. — •Christian Wolf, Andreas Einwanger, Mariusz Ciorga, Martin Utz, Dieter Schuh, and Dieter Weiss — Universität Regensburg, Universitätsstrasse 31, D-93040 Regensburg

In our recent experiments [1] we demonstrated a successful all-electrical spin injection and detection scheme in lateral semiconductor devices using (Ga,Mn)As/GaAs spin Esaki diode structures as spin aligning contacts. The experiments were performed in a nonlocal configuration, i.e., without a charge current flowing between injector an detector contacts.

In this paper we explore a possibility of an observation of a local spin-polarized charge current between source an drain in similar devices. According to Fert et al.[2] a local spin valve (SV) signal is proportional to (ρNλsf/rb)· (λsf/L), where ρN, λsf are, respectively, the resistivity and spin diffusion length in the semiconducting channel, rb is the unit area interface resistance and L a source-drain separation. Taking advantage of the relatively low value of rb in Esaki diode contacts (∼ 10−8 Ω · m2) in our devices, we optimize the latter in order to obtain a measurable local SV signal. The optimization involves (i) increasing a spin diffusion length of the semiconductor channel by lowering its doping and (ii) decreasing the source-drain distance.

[1] M. Ciorga et al., Phys. Rev. B 79, 165321 (2009)

[2] A. Fert et al. IEEE Trans. on Electr. Dev. 54, 921 (2007).

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2010 > Regensburg