Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 16: Poster Ia

HL 16.15: Poster

Freitag, 4. März 2005, 16:30–19:00, Poster TU E

Magnetotransport through nanoscale constrictions in ferromagnetic (001)-(Ga,Mn)As — •Markus Schlapps, Matthias Döppe, Tobias Feil, Matthias Reinwald, Werner Wegscheider, and Dieter Weiss — Universität Regensburg

Transport through small GaMnAs islands, separated by nanoscale constrictions from wider GaMnAs contacts, have recently shown interesting transport behaviour [1]. These constrictions act as pinning sites for domain walls and have so far shown spin-valve like effects with resistance changes Δ R/R ≈ 1% for constrictions on the order of 100 nm.

Here we show that Δ R/R is strongly temperature and current dependent and can be as high as 100% for 100 nm wide constrictions. The dependence on current, temperature and constriction width will be discussed.

[1] C. Rüster et al: PRL 91, 216602 (2003)