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024 7 _ |a 10.1103/PhysRevApplied.5.054010
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100 1 _ |a Morgan, Caitlin
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245 _ _ |a Impact of Tunnel-Barrier Strength on Magnetoresistance in Carbon Nanotubes
260 _ _ |a College Park, Md. [u.a.]
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520 _ _ |a 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.
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700 1 _ |a Misiorny, Maciej
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700 1 _ |a Metten, Dominik
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700 1 _ |a Heedt, Sebastian
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700 1 _ |a Schäpers, Thomas
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700 1 _ |a Schneider, Claus M.
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700 1 _ |a Meyer, Carola
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773 _ _ |a 10.1103/PhysRevApplied.5.054010
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