Physics – Condensed Matter – Materials Science
Scientific paper
2008-10-31
Physics
Condensed Matter
Materials Science
15 pages, 7 figures
Scientific paper
We report on our theoretical study of the magnetoresistance in spin polarized transport through a finite carbon nanotube (CNT). Varying the Fermi energy of a CNT and the relative strength of couplings to two ferromagnetic (FM) electrodes, we studied the conductance as well as the magnetoresistance (MR). Due to resonant transport through discrete energy levels in a finite CNT, the conductance and MR are oscillating as a function of the CNT Fermi energy. The MR is peaked at the conductance valleys and dipped close to the conductance peaks. When couplings to two FM electrodes are asymmetric, the MR dips become negative under a rather strong asymmetry. When couplings are more or less symmetric, the MR dips remain positive except for a very strong coupling case. Under strong coupling case, the line broadening is significant and transport channels through neighboring energy levels in a CNT interfere with each other, leading to the negative MR.
Kim Tae-Suk
Lee Byeong-Cheol
Lee Choong-Ki
Lee Hyun Woo
Rhie Kungwon
No associations
LandOfFree
Magnetoresistance in Spin-Polarized Transport through a Carbon Nanotube does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magnetoresistance in Spin-Polarized Transport through a Carbon Nanotube, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetoresistance in Spin-Polarized Transport through a Carbon Nanotube will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-457254