Large magnetoresistance in single-walled carbon nanotubes contacted different ferromagnetic metal electrodes

Abstract

Magnetoresistance (MR) in single-walled carbon nanotubes (SWNTs) with different ferromagnetic source and drain electrodes (iron and cobalt) which have different coercivity was studied. Large MR ratio of 20% could be obtained at 8 K, while 1∼2% small MR ratio could be observed for the sample with the same ferromagnetic source and drain electrodes of Co. The MR ratio of 20% is very close to the theoretically predicted value of 26% for Co-Fe system. © 2006 IOP Publishing Ltd.