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- Morgan, Caitlin, et al.
(författare)
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Impact of tunnel-barrier strength on magnetoresistance in carbon nanotubes
- 2016
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Ingår i: Physical Review Applied. - 2331-7019. ; 5:5, s. 054010-
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Tidskriftsartikel (refereegranskat)abstract
- We investigate magnetoresistance in spin valves involving CoPd-contacted carbon nanotubes. Both the temperature and bias-voltage dependence clearly indicate tunneling magnetoresistance as the origin. We show that this effect is significantly affected by the tunnel-barrier strength, which appears to be one reason for the variation between devices previously detected in similar structures. Modeling the data by means of the scattering matrix approach, we find a nontrivial dependence of the magnetoresistance on the barrier strength. Furthermore, an analysis of the spin precession observed in a nonlocal Hanle measurement yields a spin lifetime of tau_s=1.1 ns, a value comparable with those found in silicon- or graphene-based spin-valve devices.
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