Spin-coherent transport in ferromagnetically contacted carbon nanotubes

Zhao, B.; Mo¨nch, I.; Vinzelberg, H.; Mu¨hl, T.; Schneider, C. M.
April 2002
Applied Physics Letters;4/29/2002, Vol. 80 Issue 17, p3144
Academic Journal
The spin-coherent quantum transport through multiwall carbon nanotubes contacted by ferromagnetic Co pads is investigated experimentally. At 4.2 K, the devices show a remarkable increase of the magnetoresistance (MR) ratio with decreasing junction bias, reaching a maximum MR ratio of 30% at a junction bias current of 1 nA. The experimental results suggest the transport to be dominated by spin-dependent tunneling processes at the Co/nanotube interfaces and governed by the local magnetization. We also observe an asymmetry of the magnetoresistance peak position and width which is attributed to a local exchange biasing in the electrode material. © 2002 American Institute of Physics.


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