Electrical spin injection in multiwall carbon nanotubes with transparent ferromagnetic contacts

Sahoo, S.; Kontos, T.; Schönenberger, C.; Sürgers, C.
March 2005
Applied Physics Letters;3/14/2005, Vol. 86 Issue 11, p112109
Academic Journal
We report on electrical spin injection measurements on multiwall carbon nanotubes (MWNTs). We use a ferromagnetic alloy Pd1-xNix with x≈0.7 which allows us to obtain devices with resistances as low as 5.6 kΩ at 300 K. The yield of device resistances below 100 kΩ, at 300 K, is around 50%. We measure at 2 K a hysteretic magneto-resistance due to the magnetization reversal of the ferromagnetic leads. The relative difference between the resistance in the antiparallel (AP) orientation and the parallel (P) orientation is about 2%.


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