%0 Journal Article
%A Morgan, Caitlin
%A Misiorny, Maciej
%A Metten, Dominik
%A Heedt, Sebastian
%A Schäpers, Thomas
%A Schneider, Claus M.
%A Meyer, Carola
%T Impact of Tunnel-Barrier Strength on Magnetoresistance in Carbon Nanotubes
%J Physical review applied
%V 5
%N 5
%@ 2331-7019
%C College Park, Md. [u.a.]
%I American Physical Society
%M FZJ-2016-04067
%P 054010
%D 2016
%X We investigate magnetoresistance in spin valves involving CoPd-contacted carbon nanotubes. Both thetemperature and bias-voltage dependence clearly indicate tunneling magnetoresistance as the origin. Weshow that this effect is significantly affected by the tunnel-barrier strength, which appears to be one reasonfor the variation between devices previously detected in similar structures. Modeling the data by means ofthe scattering matrix approach, we find a nontrivial dependence of the magnetoresistance on the barrierstrength. Furthermore, an analysis of the spin precession observed in a nonlocal Hanle measurement yieldsa spin lifetime of tau_s= 1.1 ns, a value comparable with those found in silicon- or graphene-based spin-valvedevices.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000376274800001
%R 10.1103/PhysRevApplied.5.054010
%U https://juser.fz-juelich.de/record/811683