Iron nanoparticle driven spin-valve behavior in aligned carbon nanotube arrays

Bergeson, J. D.; Etzkorn, S. J.; Murphey, M. B.; Qu, L.; Yang, J.; Dai, L.; Epstein, A. J.
October 2008
Applied Physics Letters;10/27/2008, Vol. 93 Issue 17, p172505
Academic Journal
We report the operation of spin-valve structures formed from arrays of aligned carbon nanotubes. The devices require only one deposited ferromagnetic layer with the embedded iron catalyst nanoparticle serving as the other magnetic electrode. A peak in the resistance occurs clearly as a result of the reversal of the magnetization of the electrodes. Device magnetoresistance ratios reach 25%, yielding an estimate of the spin scattering length of 9 μm at low temperature.


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