TY  - JOUR
AU  - Morgan, Caitlin
AU  - Misiorny, Maciej
AU  - Metten, Dominik
AU  - Heedt, Sebastian
AU  - Schäpers, Thomas
AU  - Schneider, Claus M.
AU  - Meyer, Carola
TI  - Impact of Tunnel-Barrier Strength on Magnetoresistance in Carbon Nanotubes
JO  - Physical review applied
VL  - 5
IS  - 5
SN  - 2331-7019
CY  - College Park, Md. [u.a.]
PB  - American Physical Society
M1  - FZJ-2016-04067
SP  - 054010
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000376274800001
DO  - DOI:10.1103/PhysRevApplied.5.054010
UR  - https://juser.fz-juelich.de/record/811683
ER  -