Temperature-mediated switching of magnetoresistance in Co-contacted multiwall carbon nanotubes

Chakraborty, S.; Walsh, K. M.; Alphenaar, B. W.; Liu, Lei; Tsukagoshi, K.
August 2003
Applied Physics Letters;8/4/2003, Vol. 83 Issue 5, p1008
Academic Journal
We present temperature-dependent measurements of the magnetoresistance in ferromagnetically contacted multiwall nanotubes. At low temperature, the resistance increases sharply near zero-field due to misalignment of the contact magnetizations. As temperature increases, the resistance peak transforms into a resistance dip, with a peak-to-valley ratio of similar magnitude, but opposite sign. The resistance switch has a distinct temperature dependence compared with the background magnetoresistance, suggesting that the two have different origins. We propose that a ferromagnetic transition near the contact interfaces reverses the polarity of the injected spin, and changes the sign of the resistance switch.


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